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date: 16 January 2018

Humanitarian Intervention and International Security

Summary and Keywords

Humanitarian intervention is the use of military intervention in a state to achieve socioeconomic objectives, such as keeping people alive and communities functioning by providing basic necessities, without the approval of its authorities. There are three eras of humanitarian intervention: the entire time up to the end of World War II, the Cold War, and the post-Cold War period. These three eras are distinguished by differences in the structure of the international system. Ultimately, the Western intellectual tradition of just war is the foundation for contemporary international law governing armed conflict. It is grounded in natural law, which recognizes the right of sovereigns to use force to uphold the good of the human community, particularly in cases where unjust injury is inflicted on innocents. Eventually, a diverse body of literature on humanitarian intervention has developed. The contemporary debate focuses on the long-standing disagreement between positive law and natural law about coercive intervention. Political scientists use realist and constructivist paradigms to analyze the motives of intervening states and to argue for or against the practice. Proponents favor humanitarian intervention on the basis of legitimacy and the consequences of nonintervention. Opponents argue against intervention on the basis of illegitimacy, practical constraints, and negative consequences. Meanwhile, skeptics sympathize with the humanitarian impulse to help civilians but are troubled about methods and consequences.

Keywords: humanitarian intervention, military intervention, just war, international law, natural law, coercive intervention, realism, constructivism, legitimacy, sovereignty


Humanitarian intervention lies at the intersection of realism and liberalism, where power and the material interests of states meet human rights and the responsibilities of sovereignty. Military intervention for avowed humanitarian purposes has been common since the end of the Cold War and has re-energized the debate about when states can and should use military force. The literature on humanitarian intervention re-examines long-held ideas about the relationships between state sovereignty and human rights, between politics and ethics, between peace and justice. This re-examination has led to a discernible shift in the balance of opinion over the past two decades from the primacy of state sovereignty and the principle of nonintervention to an emphasis on human rights and the effort to find an agreed threshold for legitimate intervention.

Humanitarian intervention – more accurately, humanitarian military intervention – is “military intervention in a state, without the approval of its authorities, and with the purpose of preventing [or ending] widespread suffering or death among the inhabitants” (Roberts 1993:429). The essential characteristics of humanitarian intervention are the use of military means in a contentious political environment to achieve socioeconomic objectives: to keep people alive and communities functioning by providing basic necessities, such as physical security, food, and water. In most cases, humanitarian intervention leads to explicitly political endeavors of post-conflict reconstruction, nation-building, and democratization. These longer term objectives seek to address the causes of the humanitarian crisis and prevent additional violence and suffering. Humanitarian intervention does not include military extraction of foreign nationals or emergency relief operations by aid organizations without the involvement of foreign military units.

The literature on humanitarian intervention is driven by events and policy debates, rather than by theoretical arguments. Is it legitimate to intervene with force to protect people and keep them alive? If it is, what is the threshold for intervention? Who should intervene? How can such interventions succeed and what can go wrong? Answers to these questions are firmly grounded in enduring intellectual positions on moral obligation, international law, state sovereignty, and human rights. They run the gamut from strict prohibition on intervention to advocacy for action. The literature also engages new debates about appropriate roles for international organizations and nongovernmental actors in international affairs.

The following section of this essay provides a broad overview of the literature by identifying the central issues at stake, pointing out the richly diverse disciplines that inform the debate, and indicating the weaknesses in the literature taken as a whole. The next section summarizes the intellectual foundations of “just war” and state sovereignty as they relate to humanitarian intervention. In the rest of the essay, the contemporary literature’s strong orientation toward policy is recognized, and work is discussed as being in favor of humanitarian intervention, opposed to it, or sympathetic but skeptical about its efficacy.

Overview of the Literature

Historically minded accounts identify three eras of humanitarian intervention: the entire time up to the end of World War II (pre-1945), the Cold War (1945–90), and the post-Cold War period (1991–present) (Murphy 1996; Barnett 2008). The three eras are distinguished by differences in the structure of the international system. As the distribution of power has changed, so has the frequency of humanitarian intervention. The attention of scholars and policy analysts has followed suit: little was published on the topic before and during the Cold War, but with the activism of the present era, there is a striking jump in the number of publications.

For most of the twentieth century, neither states nor intergovernmental organizations engaged in humanitarian intervention. Two world wars and the collapse of empires during the first half of the century provided ample opportunities for humanitarian action, but governments understandably were preoccupied with power transitions and the demands of statecraft. After World War II, the bipolar balance of power gave geo-strategic significance to all military interventions. In that context, a strong presumption in favor of state sovereignty and nonintervention dampened the threat of superpower war and the potential for humanitarian interventions. Consequently, the topic received little attention as a subject of study.

Humanitarian intervention became a popular academic subject in the 1990s, in direct response to changes in the international system and the behavior of a few governments. The end of the Cold War in 1989 created a permissive environment in which military action by Western powers no longer contained the danger of escalation to a catastrophic international war with the Soviet Union and the Eastern bloc. The end of the bipolar balance of power also freed the United Nations (UN) Security Council from the reciprocal vetoes of the two superpowers and allowed it to become much more active. In this “new world order,” as the immediate post–Cold War period was known, Western governments, with authorization from the UN Security Council, launched interventions to protect and provide aid to civilians in northern Iraq in 1991, Somalia in 1992, and Bosnia in 1992. The number of publications on humanitarian intervention shot up in 1992 and has remained high ever since.

During nearly two decades of sustained attention, a diverse body of literature has developed from the contributions of lawyers, philosophers, political scientists, humanitarians, military officers, and policy analysts. Each of these fields brings its own intellectual perspective to the topic. The unusual range of expertise is useful for understanding the multifaceted principles and practices of humanitarian intervention. Unfortunately, the intellectual diversity has not led to much innovative and interdisciplinary work. With a few exceptions (Damrosch 1993; Holzgrefe and Keohane 2003), authors from different fields talk past one another, resulting in a theoretically underdeveloped body of literature.

To the extent that there is a shared conceptual framework, it can be found in the legal and normative work that comprises the majority of publications on humanitarian intervention. The contemporary debate is a variation of a long-standing disagreement between positive law and natural law about coercive intervention. Legal positivists base their arguments on written documents and place a high value on precedent. They focus on the stability of the international system and contend that state sovereignty and the principle of nonintervention must prevail (Arend and Beck 1993). Advocates of natural law base their arguments on moral reasoning and place a high value on actions judged to be ethically sound. They focus on the ethical treatment of humankind and contend that the rights of people trump the rights of states (Teson 1988).

Running parallel to this debate, political scientists use realist and constructivist paradigms to analyze the motives of intervening states and to argue for or against the practice. Realists emphasize the risks and costs of these “optional” interventions, while constructivists discuss the role of norms in changing the motives for intervention (Posen 1996; Crawford 2002; Finnemore 2003). Constructivists also write about the consequences of inconsistency; that is, intervention in some humanitarian crises and not in others. A separate strand in the political science literature draws on institutionalism to highlight the weaknesses and strengths of the UN and its role in the international system (MacFarlane and Khong 2006).

Pragmatism is the hallmark of publications on the military aspects of humanitarian intervention. Some authors concentrate on tactics and practices to improve the outcome of military interventions from a humanitarian perspective. Most, however, anchor their analysis in the common understanding that military action is used in the pursuit of political goals (Mockaitis 2004). Traditionally oriented authors argue that the military should not be involved in humanitarian operations that weaken the military’s ability to protect strategic national interests (Schmitt and Donnelly 2007).

The politicization and militarization of aid are anathema to humanitarians. Literature from their quarter is rooted in the principles of impartiality, neutrality, independence of action, and assistance given on the basis of need alone, all of which become corrupted by political and military interests. These principles are the conceptual foundation from which humanitarian authors argue for one of two things: to improve the outcomes of interactions with military actors, or to return to the separation of humanitarian from political and military action (Minear 2002; Terry 2002).

Despite its broad range of intellectual perspectives, the literature is dominated by just two methodological approaches. Lawyers and ethicists use rational argumentation based on legal precedents and normative principles, illustrated by reference to empirical examples. Case studies are the method of choice for political scientists, military analysts, humanitarian practitioners, and policy analysts. There is virtually no quantitative analysis or formal modeling.

Most of the good case studies delve deeply into a single country to provide case-specific analysis and rich secondary material (Clarke and Herbst 1997). Some authors, mostly political scientists, use case studies to test competing hypotheses against empirical evidence by using process tracing, multiple congruence procedures, or structured comparison (Lischer 2005). Unfortunately, the majority of the literature lacks methodological rigor. A good many authors selectively draw on cases to support their arguments and use limited evidence to make sweeping generalizations.

The literature is notable for repeated reference to a limited number of countries. Studies of the pre-World War II era look at the British effort to end the slave trade, the attack on the Barbary pirates, and intervention in Algeria. The three Cold War era cases always cited are East Pakistan (1971), Cambodia (1979), and Uganda (1979). In the post–Cold War period, the five core cases are northern Iraq after the Gulf War (1991), Somalia (1992–5), Bosnia (1992–5), Rwanda (1994), and Kosovo (1999–2000). Four cases that are often cited but have not received as much attention are Haiti (1994), Liberia (1990–7), Sierra Leone (1997–2005), and East Timor (1999–2000). Underrepresented cases include Burundi (2003–6) and the Democratic Republic of the Congo (1999–present). Darfur, Sudan (2004–present) is a constant reference point in the policy literature but, as an ongoing event, it has not been the subject of much social science research.

Despite methodological limitations, the breadth of intellectual contributions ensures that the literature on humanitarian intervention remains vibrant. The most comprehensive bibliography on the subject contained over 3,600 entries in March 2009. Reflecting the range of disciplinary approaches and the complexity of humanitarian intervention in practice, the printed version of the bibliography divides entries among 12 categories. The online version offers a list of 30 keywords (ICISS 2001, 2009).

A simpler, three-part categorization in the following sections draws attention to the core issues of legitimate thresholds, methods, and consequences. Proponents favor humanitarian intervention on the basis of legitimacy and the consequences of nonintervention. Opponents argue against intervention on the basis of illegitimacy, practical constraints, and negative consequences. Skeptics sympathize with the humanitarian impulse to help civilians but are troubled about methods and consequences.

The Evolution of Humanitarian Intervention

The Western intellectual tradition of just war is the foundation for contemporary international law governing armed conflict. It is grounded in natural law, which sees proper behavior in international politics as being governed by precepts that can be known by reason and are binding on all rational beings. Chief among these precepts is that natural rights accrue to people simply by their being human. Natural law recognizes the right of sovereigns to use force to uphold the good of the human community, particularly in cases where unjust injury is inflicted on innocents (Chesterman 2002; Nardin 2002; Bellamy 2004).

Christian theologian Thomas Aquinas developed the ethical framework in the thirteenth century, building on the earlier work of Saint Augustine. Often interpreted as a license to intervene on behalf of people subjected to erroneous religious beliefs, the just war tradition guided kings and princes for about 400 years until political and intellectual developments brought about a profound shift toward positive law. In the early seventeenth century, Hugo Grotius sought to rein in Europe’s constantly fighting princes by arguing that natural law allows intervention to protect innocents, but does not require it. Indeed, natural law prescribes mutual forbearance, for the first concern of sovereigns and all human beings is self-preservation. Grotius, however, allowed for the possibility of a sovereign using force to punish crimes against natural law, even if the misdeeds were committed by another sovereign against his own people on his own territory (Walzer 1977; Nardin 2002).

The Treaty of Westphalia in 1648 ushered in a period of peace in Europe, after the Thirty Years’ War, by placing positive law and the idea of mutual forbearance before natural law and the idea of justified intervention. This enabled the development of the modern international system, with the sovereign state as the ordering principle of power and nonintervention as the central norm (Smith 1999). The tenets of political realism fit neatly within the sovereign state system. Based on Thomas Hobbes’s conception of sovereignty as supreme authority, and Niccolò Machiavelli’s emphasis on the sovereign amassing power to realize his interests, state behavior is – and ought to be – driven by pursuing the state’s own interest, which demands acting on the basis of relative power, not ethical ideals.

The realist paradigm has prevailed for the past few centuries, but has been challenged by cosmopolitan arguments based on natural law. Among the most significant of these, for the topic of humanitarian intervention, is A Memory of Solferino, Henry Dunant’s (1986) account of caring for wounded soldiers at the final battle of Italian unification in 1859. Dunant’s call “to form relief societies for the purpose of having care given to the wounded in wartime by zealous, devoted and thoroughly qualified volunteers” led to the founding of the International Committee of the Red Cross (ICRC). The ICRC pioneered concerted humanitarian action for victims of war on the basis of international law (ICRC 2004).

Following World War II, the historical tension between inviolable state sovereignty and the obligation to respect and protect individual rights was built into the new institutions at the center of the international system. On one hand, the primacy of positive law and the prohibition on the use of force, except in defense of a sovereign state, are the core ideas in the Charter of the United Nations. On the other hand, the Universal Declaration of Human Rights, also an essential document of the UN, declares rights for people. During the Cold War, this tension usually was resolved in favor of state sovereignty over human rights, nonintervention over intervention, and international peace over justice (Ramsbotham and Woodhouse 1996; Danish Institute of International Affairs 1999). Even three cases that authors cite in retrospect as humanitarian interventions – India’s invasion of East Pakistan that led to the independent state of Bangladesh (1971), Vietnam’s invasion of Cambodia that overthrew the Khmer Rouge regime (1978), and Tanzania’s invasion of Uganda that overthrew Idi Amin (1979) – were justified at the time on national security grounds. Self-defense as a reason for the use of force better reflected the dominant normative and legal ideas of the time (Wheeler 2000; Finnemore 2003).

The quest to find a balance between peace and justice led to the revival of just war precepts. The essential modern text is Michael Walzer’s Just and Unjust Wars (1977). Walzer emphasized the limits of the legitimate use of military force. In most cases, he argued, the nonintervention principle should prevail, but he did not adhere to a strict legalist paradigm. Arguing “against realism” that communal liberty and human rights have greater intrinsic value than state sovereignty, Walzer highlighted the principles of just cause and reasonable prospects of success. “Humanitarian intervention is justified when it is a response (with reasonable expectations of success) to acts ‘that shock the moral conscience of mankind’” (Walzer 1977:107).

India’s intervention in East Pakistan sparked a debate among a small number of legal scholars and ethicists. Franck and Rodley asked (1973:275), “Is the Bangladesh incident to be seen as creating a new common law, one which accords priority to human rights and self-determination over the norms of international conduct, including legal restraints on the unilateral use of force?” Seeking to uphold the primacy of state sovereignty, they argued that the incident did not contain the basis for a definable, workable, or desirable change in international law. None of the UN conventions on human rights, they argued, allows for unilateral military enforcement (Franck and Rodley 1973). Writing after the Vietnamese and Tanzanian actions, German legal scholar Helmut Rumpf expressed alarm at the erosion of the nonintervention principle in the name of an ever-expanding set of “universal” human rights. He argued that nonintervention must be the basis of international law but, foreshadowing future arguments about the limits of sovereignty, he allowed that intervention might be justified if a state wantonly violated basic human rights (Rumpf 1981).

Arguing strongly in favor of humanitarian intervention, Teson (1988) took the position that international law is based on judgments about what is right and wrong, as is national law, and therefore is inherently normative. Drawing on the natural law tradition, Teson argued that the rights of states are derived from the rights of individuals: states do not have autonomous moral standing independent of their populations. A government that substantially violates the human rights of its people forfeits its domestic and international legitimacy. In such circumstances, military action is morally allowed to end egregious suffering and oppression (Teson 1988).

Before the Cold War drew to a close, the post–World War II emphasis on legal positivism and the realist conviction that military power should be used solely in the pursuit of national interests began to give way to natural law arguments and a cosmopolitan belief in universal moral principles and rights (Wheeler 2000). While it remained the majority position, insistence on strict adherence to the principle of nonintervention did not allow its adherents to engage with recurrent questions of theoretical and practical importance. Are states’ rights always morally and legally superior to individual rights, or are there circumstances in which states forfeit certain rights in favor of individual rights? How should governments address this tension inherent in the UN Charter? Can a meaningful distinction be made between legal and legitimate action? If states engage in humanitarian intervention, should they be condemned or instead have their actions held to high standards of judgment? These and similar questions pushed themselves to the top of the agenda at the beginning of the 1990s. Answers were shaped by events during the ensuing decade, especially interventions in Iraq in 1991 and Kosovo in 1999.

Immediately following the 1991 Gulf War – a traditional conflict in which a coalition of states drove the Iraqi military out of Kuwait – the United States encouraged the Shia population in Iraq’s southern marshlands and the Kurdish population in the northern plains to rebel against Saddam Hussein. A substantial portion of the Iraq military had survived the war and Saddam used it to crush the rebellions. The Shia received no assistance during or after their uprising and suffered severe retaliation. The Kurdish rebellion enjoyed initial success, but the Iraqi military regained control, killed as many as 20,000 Kurds and Turkomans, and drove hundreds of thousands of people toward Iran and Turkey. Turkey refused to honor its refugee asylum obligation, stranding about 400,000 people in cold mountain passes. Western governments were reluctant to intervene but rapidly changed their stance when Turkey, a member of NATO, called for help, and televised images of dying Kurds began to tarnish the shine of the recent Gulf War victory. Claiming authority to act under UN Security Council Resolution 688, France, Turkey, the United Kingdom, and the United States launched Operation Provide Comfort, the first humanitarian intervention of the post–Cold War era (Seybolt 2007).

The rescue operation was a turning point. It was seen widely as a triumph of human rights over tyranny, as recognition of the UN’s central role in conferring legitimacy on military intervention, and as proof that military means could achieve humanitarian ends. Conveniently, military action also served the interests of the great power states and the cost was relatively low. The line between cosmopolitanism and realism blurred. The egregious violation of human rights had become an offense against ethical norms of the society of states, and powerful countries saw it in their interest to do something about it (Donnelly 2002).

UN Security Council Resolution 794, authorizing intervention in Somalia in 1992, established that humanitarian crises could constitute “a threat to international peace and security,” thereby meeting the requirement of Article 2(4) for the use of force. The legal precedent for humanitarian intervention, however, was not advanced significantly by Somalia or subsequent cases, because each case was declared to be “exceptional” and not the beginning of a new legal rule. The exceptionalism of humanitarian intervention was pushed further by the 1999 NATO intervention in the Federal Republic of Yugoslavia to protect ethnic Albanians in the province of Kosovo from the Serbian government of Slobodan Milosevic. NATO violated international law when it used military force in Kosovo without authorization from the Security Council (where Russian and Chinese vetoes would have ruled out military action). Consistent with evolving state practice, alliance members offered an ethical justification for the action but they did not provide a legal defense. The lack of legal justification and the opposition of many states to humanitarian intervention suggest that the practice is far from being established in customary international law, even if there is a trend toward accepting the use of force on moral grounds in exceptional cases (Hilpold 2001; Farrell 2005).

Humanitarian Intervention Proponents

Proponents of humanitarian intervention tend to be constructivists who argue that states’ interests must be investigated, not assumed. Interests change as norms evolve, leading to changes in states’ actions (Finnemore 2003). From the constructivist point of view, military action to save the displaced Kurds demonstrated that the norm of human solidarity had developed to the point where powerful states saw it as in their interest to act. Proponents of humanitarian intervention applaud the intervention in Kosovo as evidence of a shift from inviolate state sovereignty toward the protection of human rights.

Proponents refute the legal positivist notion that nonintervention is the right approach to international relations. They advocate forceful intervention to protect innocents, and see the realist preference for supremacy of state sovereignty over human rights as morally untenable. Many proponents welcome a new era in which international actors increasingly are willing to intervene in response to human rights abuses (Chopra and Weiss 1992; Weiss 1994). Others give credence to humanitarian intervention by emphasizing its historical precedence instead of its novelty (Knudsen 1997; Bass 2008).

The strongest proponents hold that state behavior ought to be driven by moral concern and respect for certain universal principles. They begin from the cosmopolitan proposition that all people have inalienable rights. Drawing on Walzer’s work, they contend that governments, as moral agents, have an obligation to respect those rights. When a government violates the basic human rights of its population to the point of being morally abhorrent, it should no longer be protected by international law. Outsiders have a responsibility to rescue the victims of tyranny and anarchy, if the victims want to be rescued and it can be done at a reasonable cost (Teson 2001). “There are circumstances under which one is ethically bound to use force as a last resort to stop a greater evil” (Malazogu 2003:127).

Proponents are confronted with the argument that natural law can lead to the abuse of humanitarian intervention rhetoric by strong states to pursue selfish national interests. The United States, for example, claimed humanitarian motives for its 2002 invasion of Iraq. Russia claimed humanitarian motives for its 2008 intervention in Georgia. Proponents respond that the misuse of humanitarian rhetoric can be controlled by understanding that natural law and positive law are complementary. “Natural law provides a common way of thinking about the morality of war, while legal positivism acts as a vital break on abuse” (Bellamy 2004:144). The best way to find the appropriate balance is through collective deliberation – a process of negotiated consent that confers legitimacy on the decision to intervene (Donnelly 2002; Barsa 2005) Governments engage in collective deliberation when they seek approval from the UN Security Council, as they did, for example, in Somalia (1992), Bosnia (1992), Rwanda (1994), and East Timor (1999). This multilateralism simultaneously constrains the abuse of power and legitimizes the use of force.

Proponents recognize that the Security Council will not always approve military intervention, even in response to atrocities, because of the veto power of the five permanent members and the resistance of many smaller states to the erosion of the nonintervention principle. This recognition divides proponents into three positions on the importance of UN Security Council authorization. The first group, positivist by inclination, insists that Security Council authorization is necessary. The UN Charter forbids the use of force except in self-defense or as authorized by the Security Council. Unauthorized use of force weakens the UN, opens the door to great power adventurism, and delegitimizes humanitarian intervention (Thakur 2006).

The second group strongly prefers Security Council authorization but says that other multilateral bodies, such as the UN General Assembly or a regional intergovernmental organization, have legal authority to approve an intervention if the situation is dire and the Security Council does not authorize action (Wheeler 2000; ICISS 2001).

The third group prefers Security Council authorization but argues that humanitarian intervention can be legitimate even if does not comply with international law. The commission established to investigate NATO’s attack on the Federal Republic of Yugoslavia over the matter of Kosovo caused a small sensation when it concluded that the action was illegal but legitimate on the basis of extreme humanitarian need (Independent International Commission on Kosovo 2000). A few authors go as far as to argue that unilateral humanitarian intervention should be considered legal as well as legitimate if it addresses severe human rights abuses and intergovernmental organizations are paralyzed and unable to stop the abuse (Benjamin 1992).

Multilateralism is the preferred method of intervention because it bolsters legitimacy by serving as a check on the military activities of a single state (Hoffman 1995/6). In the early 1990s, the quest for legitimacy led a number of writers to call for the building of a capable UN military (Connaughton 1992; Mazarr 1993). After observing the poor record of UN military efforts in Somalia, Bosnia, and Rwanda, analysts questioned the wisdom of relying on UN forces in hostile environments. Reliance on states, however, raises suspicion about motives and activities (Danish Institute of International Affairs 1999). When France set up Zone Turquoise in south-western Rwanda at the end of the 1994 genocide, it asked other states to be involved. The only other troop contributor was France’s ally Senegal, which did little to assuage suspicion that France’s intention was to rescue its erstwhile allies in the genocidal Rwandan government (Des Forges 1999). In other cases, such as the Australian-led intervention in East Timor in 1999, multilateral intervention has dampened charges of neocolonialism.

Nowhere is the suspicion of political motives stronger than among humanitarian aid organizations. Yet, in the early 1990s, some aid organizations came out as proponents of humanitarian intervention in the new world order. They strenuously called for military help to address the famine in Somalia because violence and banditry prevented effective aid operations. Virtually all aid organizations now consider that to have been a grave mistake. The fundamental humanitarian principles of delivering aid on the basis of need, independence, impartiality, and neutrality all rest on the idea that humanitarian action is separate from politics and the competition for power (Sphere Project 2004). Experiences from Somalia to Afghanistan have reinforced this point of view. Aid organizations recognize that they can sometimes benefit from military intervention in cases of ongoing violence, but they seek a strict division of labor such that the military creates a secure environment and stays away from humanitarian relief activities.

In contrast to humanitarian practitioners, the strongest proponents of humanitarian military intervention say that the gravest political mistake is the failure to intervene in places where the world knows there are mass atrocities (Weiss 2004). The lack of intervention often is attributed to the failure of political will. Since humanitarian crises usually happen in countries that are not strategically important for the great powers, there is little political motivation to accept the risks and pay the costs of intervention (Hoffman 1995/6). A second explanation is that intervention is not feasible in many cases. No one called for humanitarian intervention in the Russian province of Chechnya, despite massive civilian suffering during the war. A third explanation – that there simply is not agreement on when humanitarian intervention is allowed or expected – returns to the debate on the conditions for the legitimate use of force.

Former UN Secretary-General Kofi Annan brought that debate to the forefront of diplomatic discussion and analysis after the NATO-led military operation in Kosovo in 1999. In his “Millennium Report” to the General Assembly, Annan challenged states to find a balance between the principles of state sovereignty and humanity: “if humanitarian intervention is, indeed, an unacceptable assault on sovereignty, how should we respond to a Rwanda, to a Srebrenica – to gross and systematic violations of human rights that offend every precept of our common humanity?” (ICISS 2001:vii).

Annan’s challenge led to the publication by an independent commission, the International Commission on Intervention and State Sovereignty (ICISS), of The Responsibility to Protect (ICISS 2001), which has become the centerpiece of the humanitarian intervention literature. The report changed the nature of the debate by predicating state sovereignty on the protection of basic human rights. It emphasized that sovereignty confers responsibilities as well as rights. In particular, the commission argued, a government must safeguard the lives of people on its territory. If a government does not or cannot fulfill that responsibility, other governments, authorized by the UN, have the right to act, including to use military force as a last resort (ICISS 2001).

The UN has been the main forum for discussing the implications of reconceptualizing sovereignty as responsibility. The Secretary-General’s High-level Panel on Threats, Challenges, and Change recognized in 2004 “the emerging norm that there is an international responsibility to protect [civilians][…]in the event of genocide and other large-scale killing, ethnic cleansing or serious violations of international humanitarian law…” (United Nations 2004). The concept of the responsibility to protect was included in the Secretary-General’s report In Larger Freedom in preparation for the General Assembly’s World Summit (United Nations 2005b). On the occasion of the sixtieth anniversary of the founding of the UN, the largest ever gathering of heads of state endorsed the 2005 UN World Summit Outcome Document, which contained two extraordinary paragraphs regarding the responsibility to protect. The leaders committed to:

use appropriate diplomatic, humanitarian and other peaceful means […] to help protect populations from genocide, war crimes, ethnic cleansing and crimes against humanity. In this context, we are prepared to take collective action, in a timely and decisive manner, through the Security Council, in accordance with the Charter, including Chapter VII, on a case-by-case basis and in cooperation with relevant regional organizations as appropriate, should peaceful means be inadequate and national authorities manifestly fail to protect their populations […].

(UN 2005)

Timely and decisive collective action, in accordance with Chapter VII, is UN diplomatic parlance for military intervention without the consent of the sovereign government. The heads of state, in other words, put their signatures to a fundamental challenge to the positivist concept of state sovereignty. The idea that governments and, if they fail, other international actors have a responsibility to protect people from four types of atrocities also has won supporters among those analysts who are sympathetic to humanitarian intervention but skeptical about its application on political and normative grounds (e.g. Thakur 2006).

To summarize the proponent position, there is a fair amount of agreement on when to intervene, a narrow but opposing set of answers on who should do it, and little thought given to how to intervene. Since the publication of The Responsibility to Protect report, proponents have coalesced around a modern interpretation of just war principles. The report sets out the principles of just cause and right authority as threshold criteria for military action, and the principles of proportionality, last resort, right intention, and reasonable prospects of success as “other precautionary criteria.” The Outcome Document is more specific when it defines just cause as genocide, war crimes, ethnic cleansing, and crimes against humanity. Right authority, according to the report, rests with the UN Security Council (ICISS 2001; United Nations 2005a).

The remaining disagreement among proponents about who should intervene is between those who continue to favor UN-led interventions and those who believe that experience has shown that humanitarian objectives are better served by state led coalitions authorized by the UN. In either case, governments must show the political will to contribute troops and equipment. As Kurth (2005) and others point out, governments willing to risk their troops do not have the military capacity to intervene without considerable help from others; governments that do have the capacity are rarely willing to risk their troops. Moreover, the United States, the most capable of intervening, has undermined its legitimacy by fighting the war in Iraq (MacFarlane et al. 2004; Kurth 2005).

Proponents have not addressed in a serious and sustained way difficult questions about how military force can be used for humanitarian ends. When writers sympathetic to the humanitarian argument engage the question of how to intervene, they tend to move into the camp of skeptics, discussed below.

Humanitarian Intervention Opponents

Scholars and policy analysts who oppose humanitarian intervention make strong arguments that the practice is normatively indefensible, does not conform to international law, does not advance the interests of the intervening states, and is ineffective.

The broadest critique of humanitarian intervention is really an argument against the current international order. According to this perspective, the discourse on intervention is unable to move beyond a limited focus on decision-making because it fails to examine the liberal internationalist context in which humanitarian emergencies take place. Humanitarian intervention is a problem-solving approach that ignores the “economic statism” that leads to humanitarian crises and simply seeks to restore the international order that gave rise to the conflict in the first place (Pawlowska 2005).

Less radical writers also pay close attention to international context, often with emphasis on power imbalance. They argue that humanitarian intervention is a variant of colonial depredation: it is an instrument of strong states’ domination over weak ones. European and North American governments choose the targets of intervention according to their strategic interests. The involvement of the UN Security Council does not help, as the Council is “less than representative” and gives a handful of states inordinate influence through the veto provision (Ayoob 2001). In addition to being patently discriminatory, forcible intervention encourages violence. Any intervention eventually will provoke local opposition (Roberts 1993).

Opponents’ third criticism is that military intervention is not appropriate or necessary. Violence was an essential part of the process that established political order in the West. On one hand, we should expect there to be violence as new, weak states struggle to impose their authority. On the other hand, when a state is overly oppressive and abuses its population, the people, through the principle of self-determination, have a right to use violence against the government. That right does not extend to actors outside the state, who are not subject to the abuse. Intrastate violence, even with refugee flows, does not constitute a threat to international peace and security (Walzer 1977; Ayoob 2001). Adam Roberts makes the point that those who are concerned about justice should not underestimate the power of patient promotion of human rights. The principle of nonintervention reduces the risk of war, respects the differences between societies, and allows for the development of rights within societies rather than imposing them from outside (Roberts 1993).

Opponents make a similar argument based on international law: the UN Charter fundamentally prohibits humanitarian intervention; self-defense is the only unambiguous justification for the use of force. “[A]s a legal concept […] humanitarian intervention is incoherent – any ‘right’ of humanitarian intervention amounts not to an asserted exception to the prohibition of the use of force, but to a lacuna in the enforceable content of international law” (Chesterman 2002:2). Arguments that humanitarian intervention is compatible with Article 2(4) of the UN Charter are not persuasive, opponents say. Even when international law is not enforceable for practical reasons, the prohibition on the use of force remains. In extremis, a state invalidates its sovereignty when it perpetrates atrocities against its citizens, but it is up to the people to exert their right of self-determination (Chesterman 2002).

These normative and legal objections are bolstered by an array of pragmatic arguments against humanitarian intervention. First, humanitarian intervention attempts to do the impossible. Effective humanitarian action necessitates understanding the limits of humanitarianism: it is beyond the competence of humanitarianism to advance the cause of human rights, contribute to conflict resolution, and promote social justice. It is delusional to imagine that an ambitious peace and justice agenda can be met by using force, simply because humanitarian imperatives are matched with just war principles. Historically, national militaries fight wars to win not merely to secure humanitarian access for aid workers. Western countries, the most militarily competent to carry out interventions, continue to view humanitarian action as an instrument to achieve self-interested objectives. It is not reasonable, therefore, to expect military practice to reflect the ideal of moral universalism (Rieff 2005).

For most realists, the problem is not that humanitarian action is instrumental for achieving self-interested objectives, but just the opposite. They worry that interventionist countries lose touch with their national interests. In the early post–Cold War years, when liberal internationalists saw great potential to do good in internal conflicts by working through the unshackled UN, realists cautioned that the “new interventionism” could grow out of hand “until the United States and the United Nations ultimately take on tasks for which they are ill-prepared, leaving themselves embroiled in numerous internal conflicts without the will or resources to bring peace to any” (Stedman 1993:2). The Clinton administration did exactly that by treating US foreign policy as “social work.” Three failed military interventions in the peripheral countries of Bosnia, Somalia, and Haiti, in its first year in office, dominated the foreign policy agenda of President Clinton’s entire first term and prevented the United States from focusing on its vital interests (Mandelbaum 1996).

In addition to distracting governments from national interests, opponents say that humanitarian intervention is inherently difficult and likely to fail. At best, even a large military force can do only a little good (Posen 1996). When political leaders commit themselves to humanitarian intervention, they must recognize that they are engaged in a military operation where one or more armed parties do not consent to a foreign military presence. They should be ready for a fight, as experiences in Somalia, Bosnia, and the Democratic Republic of the Congo show. Intervening troops attempt to deter attacks on civilians and aid operations, or to compel gunmen to stop attacks after they have begun (a harder task), but the attempt often fails. When deterrence fails, interveners must choose between standing by as atrocities occur (like the Dutch UN battalion in Srebrenica, Bosnia) and using deadly force against the attackers (like the Australians in East Timor). According to this view, intervening forces should be able to dominate the battlefield in order to attain their objectives quickly with as few casualties as possible. Dominating the battlefield almost always requires significant air and ground forces and a large logistical infrastructure to support them (Seybolt 2007). Rarely have governments committed the necessary resources for short-term success, much less for the complex phase of rebuilding shattered societies.

While realist opponents see danger to national interests when militaries get involved in humanitarian efforts, recent practice has turned this around, and has confirmed the worst fears of humanitarian opponents. In Afghanistan and Iraq, the US government considered humanitarian work to be “a force multiplier” – a term usually used for things that confer military advantage, such as a good intelligence system or a strong logistics train. Using humanitarian aid for political ends in a conflict zone was an explicit objective of the Provincial Reconstruction Teams (PRTs) that American and allied troops first established in Afghanistan in 2002. Military personnel, with some civilians, staff PRTs with the aim of improving local governance and doing quick impact development projects to win hearts and minds (Perito 2005).

Many humanitarian practitioners argue that the economic development activities of military personnel in PRTs challenge the humanitarian principles of impartiality, operational neutrality, and independence. There is only weak evidence to suggest that the principles are challenged, according to a study by an author sympathetic to the humanitarian view, but the purposes the principles are meant to serve – safety and access – have suffered. Politically motivated attacks on humanitarian workers in Afghanistan and Iraq increased and the amount of coordination with humanitarian nongovernmental organizations (NGOs) decreased, making aid operations less efficient (Harmer 2008).

Finally, opponents contend that the concept of the responsibility to protect is untenable. Its critical weakness is that reaction to atrocities has been framed as coercive protection that can be undertaken without the consent of the host government. Preventive measures and noncoercive persuasion have been ignored. This interpretation demands an international protection capability that does not now exist and cannot realistically be expected. The case of Darfur highlights the operational and strategic shortcomings of the concept. The African Union Mission in Sudan and its successor, the UN–African Union Mission in Sudan, lack the ability to protect civilians. Worse, their deployment distorted the negotiation process and made resolution of the conflict more difficult (De Waal 2007).

Humanitarian Intervention Skeptics

Skeptics support humanitarian intervention on moral grounds but they caution that there are myriad problems to be addressed. The international lawyers who belong to this category distinguish themselves from opponents of intervention by finding contextual legal justification for action in the face of atrocity. Most skeptics – writing from political, military, and humanitarian points of view – focus on the unintended consequences and pragmatic difficulties of intervention. They do not, however, conclude that humanitarian intervention should be avoided. Instead skeptics seek to understand the circumstances under which it is more likely to succeed by devoting most of their attention to questions of who should intervene and how.

Most troubling for skeptics are the unintended negative consequences of intervention. Humanitarian intervention can exacerbate the conflicts whose consequences it seeks to address by distorting local economic markets, feeding militants and their families, creating spoilers, empowering warlords, and providing incentives for future conflict (Macrae and Zwi 1994; Anderson 1999; Maley 2002; Terry 2002; Kuperman 2005). Governments and aid organizations can begin to address these problems by recognizing that humanitarian intervention is a political activity. This recognition is only part of the solution, for it is deceptively difficult to understand the political context of these complex conflicts (Lischer 2005).

Writers in this category tend to let others debate the normative and legal questions, but they do not entirely ignore the issues. Some scholars argue that international law provides no ground for initiating military action to protect human rights, as noted in the preceding section. The two documents that are the basis for international humanitarian law protect individuals during war but do not allow war for the purpose of protection. The Geneva Conventions of 1949 provide for protection and care of wounded, sick, and imprisoned soldiers during war. The Additional Protocols of 1977 extend similar legal protection to civilians (ICRC 2005). It can be argued that the Convention on the Prevention and Punishment of the Crime of Genocide and the International Covenant on Civil and Political Rights allow for humanitarian intervention, but they exist in the context of prohibitions on the use of force contained in the UN Charter (Heinze 2004).

To resolve this problem, skeptics take a natural law approach and turn to normative and moral arguments in addition to legal analysis. In doing so, some scholars find room for intervention in a contextual reading of the UN Charter. They argue that international law is constantly changing in response to the behavior of states and nonstate actors. Existing law, therefore, is not a decisive barrier to illegal actions, if those actions are aimed at reforming international law in such a way that it rectifies serious injustice supported by the current legal system (Buchanan 2003; Franck 2003; Stromseth 2003; Heinze 2004; Farrell 2005). Other scholars contend that making unilateral humanitarian intervention legal would do more harm than good, although using force “to end grave humanitarian crises can hardly be disapproved of morally” (Hilpold 2001:467).

Most skeptics are concerned about legality and legitimacy for their instrumental role in making humanitarian intervention effective (or ineffective). They contend that intervention must be seen to be legitimate if it is to succeed over the long term (Lahneman 2004). In this regard, the UN plays an irreplaceable role. It is the centerpiece of a rules-based system of international relations. For weak countries, the most important rule is the prohibition on intervention, yet many developing countries are not absolutely opposed to intervention in all situations. Rather, they are concerned with double standards and selective intervention by powerful states against weak ones. Collective action through the UN – the only entity that can authorize the use of force on behalf of the collective of states – constrains the use and possible abuse of humanitarian intervention (Hoffman 1995/6; Thakur 2006).

While authorization by the UN Security Council is widely agreed to be important, if not essential, there are different views among skeptics about which actors in the international system ought to carry out the intervention. Disagreement centers on whether the UN has the ability to conduct military operations in countries where foreign troops are not welcome, or whether it should authorize intervention by coalitions of states.

In the wake of several disastrous experiences in the 1990s, the UN Secretariat itself recognized the many shortcomings of UN peace operations in the Report of the Panel on United Nations Peace Operations. The “Brahimi Report,” as it is known, posited “the key conditions for the success of future complex operations are political support, rapid deployment with a robust force posture and a sound peace-building strategy” (United Nations 2000a:1). It went on to observe that UN operations had rarely achieved the first condition and had virtually never achieved the second and third conditions. The report recommended that the UN radically overhaul its peace operations, from developing coherent strategies, to authorizing realistic mandates, drawing up robust military doctrine, and creating headquarters support for its ad hoc deployments (United Nations 2000a). A follow-up study by the primary authors of the UN document found “clear progress in implementing a majority of reforms recommended by the Panel” (Durch et al. 2003:xv). The UN has fielded a number of new operations since the publication of the Brahimi Report. Most of them have been fairly successful, but the few that have been deployed in challenging environments, such as the Democratic Republic of the Congo and Darfur, Sudan, have had mixed records at best.

Optimism in some quarters notwithstanding, a number of authors have argued that states should take the lead in situations where there is not broad consent because military coalitions under the command of a lead country are inherently more capable than UN-led operations (O’Hanlon 1997; Oudraat 2000; Lahneman 2004). They contend that the UN ought to lead operations in permissive environments, but that states remain the interveners of choice in nonpermissive environments, where not all armed actors have consented to intervention. To succeed in a hostile environment an intervener must act quickly, devote considerable military strength to the effort, and be willing to risk soldiers’ lives. The UN has trouble meeting these requirements. They are best met when humanitarian and political interests are at stake, as they usually are in state-led operations. The pragmatic perspective holds that political motives for intervention are to be sought, not avoided, as long as they are compatible with humanitarian objectives (Seybolt 2007).

Critics of UN-led military operations recognize that state-led interventions are not a panacea; they operate under a number of constraints. The leaders of industrialized countries – which have the capabilities to lead coalition military operations – strongly desire to avoid having their soldiers killed. They believe that their constituents will not support a military adventure to save the lives of strangers at the cost of the lives of fellow citizens. The US decision to leave Somalia in 1993 after losing 18 soldiers supports this belief. Research indicates, however, that leaders can build support for humanitarian action when they persuade the public of its merit (Kull and Destler 1999). The Australian government continued to see popular support for action after it warned of the likelihood of losing military personnel when it led the 1999 intervention in East Timor. No Australian troops were killed so the strength of the support was not tested.

At a deeper level, caution comes from an implicit moral contract between democratic governments and their military personnel that rests on shared assumptions about the ends to which national militaries will be used, namely the protection and advancement of vital national interests (Cook 2000). While Western governments occasionally are willing to put their soldiers in harm’s way, their overriding concern is force protection rather than civilian protection. This puts them at a disadvantage against adversaries who are not as risk averse. The effectiveness of humanitarian intervention is limited as a result (Gray 2002).

Military operations to protect civilians and aid organizations are different enough from standard military operations that they require specialized doctrine and skills. Skeptics increasingly are paying attention to the problem that neither national militaries nor the UN have appropriate doctrine for how to protect people during conflicts, particularly when the people are the intended targets of violence. No matter how legitimate an intervention is deemed to be, or how willing political leaders are to pay the costs of military engagement, no operation is likely to succeed if the military units on the ground do not have the appropriate doctrine, training, and equipment to do the job. Readiness can be improved through preparation, planning, and training, but it requires overcoming institutional inertia (Chayes and Chayes 1999; Holt and Berkman 2006).

Skeptics point out equally challenging considerations on the humanitarian side. During the post–Cold War period, peace operations – both UN- and state-led – have evolved into ever more complex efforts to rebuild social, economic, and political systems. Humanitarian intervention increasingly is not just about stopping the dying. It is also about addressing the causes of violence and attempting to create the conditions for stable peace. As part of this effort, international organizations and NGOs have taken on functions that would be done by the government in a well-functioning state, such as providing health care and policing. These efforts often founder because external actors have a poor understanding of the complex situations in which they work; they have insufficient capabilities to address the myriad needs; and they lack patience to complete long-term processes of institutional development (Farer 1996; Maley 2002; Donini et al. 2004).

The current stage of development of the responsibility to protect concept can be seen as a summary of the skeptical position on humanitarian intervention. Military intervention to prevent or end mass atrocities is legitimate. It should be limited to extreme cases and should be the last resort after all nonmilitary means have been considered and rejected as inadequate. The UN must authorize intervention to prevent individual states from abusing the rhetoric of humanity to promote selfish national interests. Within this basic framework, each particular case will pose difficult questions about how to intervene successfully, avoid unintended consequences, and create the conditions for reconstruction and social rehabilitation.


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Daniel Carik, Megan Carniewski, Pam Daley, Peace Medie, and Corey Sczechowicz provided valuable assistance by summarizing numerous books and articles. Their hard work made this essay possible.