International Law and the U.S. Invasion of Iraq (2003)

Introduction: The Legal Debate Over the Iraq Invasion

The invasion of Iraq by the United States prompted a wide-ranging debate about the use of military force without explicit approval from the United Nations. Whether this show of force was truly legal and legitimate became a question considered by many individuals and governments. Some argued that there was implied authorization because a resolution created during the Gulf War continued to authorize any force necessary to ensure Iraq's compliance with the cease-fire established at that time. The United States government also argued that Iraq posed an imminent threat to many countries and to international security and peace, and that the United States was therefore entitled to act in preemptive self-defense.

It is important to examine these claims carefully on a legal basis and to explore the background of the war in Iraq. Others argue against any legal right of the United States to initiate this war, basing their position on assessments and statements made by members of the Security Council and on the view that Gulf War-era resolutions were never intended to authorize subsequent uses of force against Iraq. A further resolution passed in November 2002 is also said to have provided no implied authorization for the use of force. The self-defense argument is similarly contested: extensive testimony and reporting have confirmed that no weapons of mass destruction were located within Iraq, undermining one of the central justifications offered by the coalition.

Those who oppose the war as a matter of international law contend that the justifications advanced stretch legal principles so far that the principles themselves are effectively undermined. Operation Iraqi Freedom began on 20 March 2003, when the United States, Australia, and the United Kingdom launched missile attacks on Baghdad aimed at removing the Iraqi leadership. After approximately three weeks of operations, American troops took control of Baghdad within two days. On 2 May 2003, President Bush announced that the coalition had achieved victory in Iraq.

According to Bush, however, the battle in Iraq was only a small victory in the broader war on terrorism that had allegedly begun with the terrorist attacks of 11 September 2001. The coalition believed it was necessary to eliminate the threat that Iraq posed to the United States and its allies. Coalition leaders also stated that the lives of many Iraqis would be improved, that humanitarian assistance could be delivered more easily, and that Iraqis could establish a peaceful, democratic state in which they determined their own futures — free from an authoritarian leader such as Saddam Hussein.

Authoritative sources have suggested that between 7,000 and 9,000 Iraqi civilians were killed by coalition forces, and it is considered quite likely that the actual number was considerably higher. Greenpeace and other peace-promoting organizations have argued that the United States threatened the framework of international law by refusing to accept it as it stood and instead seeking to reinterpret it so that its preferred actions would appear lawful.

Legal challenges are therefore present on both sides of the debate over the invasion. Some believe that international legal rules exist precisely to prevent states from acting in ways that cannot be readily justified. The invasion suggests to many observers that the United States viewed international law as a purely instrumental device for validating its own actions — that international law can be interpreted and explained in ways that uphold almost any course of action a nation wishes to take.

Investigating these claims is vital because the debate over whether the Iraq war was legal under international law remains significant. It appears that most of the arguments put forward by Australia, the United Kingdom, and the United States lack strong legal footing. Rather than demonstrating that international law is infinitely malleable, however, this paper seeks to show that international law constitutes a powerful framework that enables meaningful debate among nations about whether particular actions were legitimate. The United States and its coalition partners apparently manipulated international law to some degree for strategic benefit, making arguments that were generally not accepted by most of the international community.

The UN Charter Framework on the Use of Force

This is significant because the principles governing international law were stretched so far by the United States and its justifications for war that they risk losing their meaning altogether. The war was allegedly authorized by the UN Security Council, but this interpretation stretches the meaning of many prior Security Council resolutions and obscures the Council's actual intent. Claiming self-defense also stretches that concept far enough to make aggression and self-defense appear indistinguishable. International law lacks the punitive mechanisms of domestic law, but the inability to legally justify the war should nonetheless diminish the legitimacy of the campaign itself, and those who instigated it should bear the corresponding costs.

Determining whether the invasion of Iraq was legal is essential for evaluating not only the legitimacy of the war itself but also the future impact of such actions on the international community. International law is broadly framed by the UN Charter, though it is not limited to what the Charter says. One key provision dealing with the use of force states that nations should refrain from using force or the threat of force against the political independence or territorial integrity of other nations. This prohibition was intended to be interpreted broadly and applied in a general sense.

The UN Charter recognizes two exceptions to this prohibition. First, measures authorized by the Security Council are binding on all member states, and the Security Council is permitted to authorize military force when necessary to restore or protect international security and peace. Second, all nations retain the right to use force in self-defense. The law governing recourse to force in the international community is highly complex, but the general consensus among nations is that the basic rules contained in the UN Charter reflect customary international law.

In general, most nations agree on the applicable law and its basic content. Disagreements tend to arise when applying this law to specific facts or circumstances. These basic rules are central to the debate over the legality of the United States' use of force in Iraq, because the United States relied primarily on the two exceptions described above. Critics argue that the coalition disregarded established principles, while supporters maintain that the United States did not in fact disregard any international legal principles or attempt to rewrite the rules — rather, it interpreted the law's application based on the facts as it understood them and concluded that it had the right to invade.

Security Council Resolutions and Implied Authorization

The United States and other coalition members argued that existing Security Council resolutions provided sufficient authority to justify the use of force against Iraq. On 10 November 2002, Secretary of State Colin Powell indicated that the United States believed there were both past and current material breaches by Iraq that provided enough authority to take action. Iraq had consistently violated numerous Security Council resolutions, many of which concerned facility inspections and disarmament. These ongoing violations formed the primary rationale for military action. The terrorist attacks and alleged links between Iraq and Al Qaeda added to the tension, but disregard for Security Council resolutions was the strongest legal case advanced and formed much of the basis put forward by the United Kingdom and Australia.

Several resolutions were cited in support of this argument. The first key resolution had authorized the use of force not only to remove Iraqi troops from Kuwait but also to restore international security and peace in the region. After Kuwait was liberated, the same resolution set out terms Iraq would need to accept for a cease-fire, including the unconditional removal, destruction, or rendering harmless of all biological and chemical weapons, research facilities, subsystems, and ballistic missiles with a range greater than 150 kilometers.

A broader cease-fire package was also established, incorporating UN peacekeepers along the border, the return of property stolen from Kuwait during the occupation, and financial reparations to foreign nationals and corporations that suffered losses as a result of the war. This package was exceedingly broad, and disarmament was only one component of it. Nevertheless, this resolution was interpreted as establishing criteria by which the United States and other countries could judge whether peace and security had actually been restored to the region. If the resolution was breached, it was argued, authority to use force to remedy that breach was revived.

Additional resolutions dealt specifically with Iraq's disarmament. The United Nations eventually identified Iraq as noncompliant and as a threat to international peace and security. Further resolutions found Iraq in material breach of earlier obligations and warned of serious consequences for continued non-compliance. The public debate about what "serious consequences" meant was considerable, but the governments of Australia and the United Kingdom did not attach great significance to this phrase. Instead, they emphasized another point: that Iraq's material breach of its obligations meant that the authority other nations had to use force against Iraq had been revived and would remain in effect until Iraq came into compliance.

Both Australia and the United Kingdom argued that the Security Council had indeed authorized the use of force and that the war against Iraq was therefore fully legal under international law. By contrast, the United States administration never formally articulated its complete legal case for war. Secretary of State Powell suggested that the United States believed there was probably enough authority in existing resolutions to act if Iraq continued to refuse cooperation — but this was not a formal legal argument, and Powell's own language made clear only a degree of probability rather than certainty.

When President Bush ordered the invasion and informed congressional leaders, he made only a passing reference to Security Council resolutions as a legal basis. He insisted that the United States acted to enforce relevant Security Council resolutions, but the main thrust of his argument lay elsewhere. The United States then developed two specific legal arguments. First, Bush agreed with Australia and the United Kingdom that reviving Resolution 678 provided authorization for war. Second, and more centrally for the United States, the invasion was characterized as a continuation of the global war on terror, which in turn supported a self-defense justification: the United States needed to defend itself against further terrorist attacks. These two legal theories — implied revival of Security Council authority and preemptive self-defense — formed the twin pillars of the coalition's legal case.

Even though the argument about Iraq's breaches and Saddam Hussein's non-compliance was powerful, the Security Council did not find it wholly compelling. Earlier statements from the United States and the United Kingdom enhanced the legal case somewhat but did not reflect the will of the Security Council as a whole. Some evidence suggests that references to "serious consequences" were not intended to authorize force. Others argue that resolutions allegedly revived to authorize military action could not in fact be so easily resurrected and were invoked only as a post-hoc justification for a war driven by self-interest.

In 1998, when Operation Desert Fox was discussed within the Security Council, it received very little support. Some nations viewed it as unprovoked and groundless; others insisted that Security Council resolutions provided no basis for such action. States that did not comment explicitly tended to side with those opposing the operation, suggesting that the majority of Security Council members did not accept the argument that existing resolutions authorized Operation Desert Fox. At most, only six of the fifteen UN members appeared to have supported this position, and several of those states were either NATO members or aspiring members, which may have influenced their stance.

The argument for reviving Resolution 678 unravels quickly under close examination. The British ambassador stated that authorization should only be considered revived if the Security Council determined that a sufficiently serious breach of a resolution had occurred. During Operation Desert Fox, the Security Council did find Iraq in breach of its obligations — but it did not conclude that the breach was serious enough to warrant the use of force. Significantly, the British ambassador also stated clearly that it was for the Security Council, not individual nations, to determine whether a sufficiently serious breach had occurred.