Ideally, a body of law comprises a set of coherent and consistent rules. These rules contribute to the creation of an environment that is predictable, efficacious, and just. Most international lawyers hope, expect, or believe that such a body of a law can exist for international system. This is a fool's errand.

Clear bodies of international law may develop in specific issue areas, but only if they create self-enforcing equilibria; that is, if the relevant parties, those with the ability to violate the rule, believe that they would be worse off if they did. Even when self-enforcing equilibria do exist, they last only so long as the interests and capabilities of actors, which may always change, generate a structure of payoffs that induces continued rule adherence. Many issues, including core questions related to sovereignty, will never be able to generate self-enforcing equilibria in the first place.

The international law rules governing "indirect" expropriations of property reveals a tension between the interest, on one hand, of protecting rights of foreign property owners and investors and, on the other hand, the interest of protecting the sovereign authority of states to regulate in further of public welfare goals. The tension is embodied in the formal doctrine. Thus, a state is responsible under international law for regulation that unreasonably interferes with the foreign owner's enjoyment of his or her property. At the same time, however, the doctrine recognizes that regulation "commonly accepted as within the police power of states" does not give rise to liability for a regulatory taking.

International courts and tribunals are reluctant explicitly to substitute their judgment for that of sovereign state parties before them with regard to the legitimacy of or justification for the particular police power goals those states have decided to pursue through a given regulatory measure. This results in artificially truncated approaches to indirect expropriation cases. In some cases, tribunals focus only on the effect of a regulatory measure on the owner, without regard to the state's purpose. More recent developments in state practice suggest that whenever a state claims a public welfare purpose for regulation, it will not constitute an indirect expropriation of property.

Nevertheless, implicit in the decisions of international tribunals and the practice of states in negotiating property claims settlements is a normative assessment of the legitimacy of the particular police power or public welfare purposes to be served by a particular regulatory measure. These implicit assessments have been keyed not to the socio-political standards of the state adopting the regulation, but to international standards. As such, the question of whether a regulatory measure constitutes an indirect expropriation under international law will depend in part on the extent of international acceptance of the particular substantive public welfare purposes a regulatory measure seeks to advance. Future scholarship should evaluate decisions of international tribunals and state practice to develop clearer and more explicit guidelines on the question of which classes or categories of regulatory purposes are accepted by both developed and developing states as requiring property owners to bear the costs or regulation, and which require the state to provide compensation.

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President George W. Bush has demonstrated impressive flexibility in reshaping his approach to foreign policy to deal with the new international challenges brought to the fore by the terrorist attacks.

Before Sept. 11, President Bush embraced a humble mission for the United States in the world. This country, he believed, had to "preserve the peace" by seeking to maintain the basic balance of power between nations. Now, Bush has abandoned the preservation of the old system. Instead, he seeks to change it by promoting liberty, freedom and eventual democracy in countries ruled by autocrats.

In doing so, Bush lines up next to "idealists" or "liberals" such as Ronald Reagan, Woodrow Wilson and Immanuel Kant, and implicitly distances himself from realists focused solely on the balance of power such as Richard Nixon, Thucydides and his own father, the 41st president.

In a second remarkable change, Bush has become a supporter, at least rhetorically, of nation building. Before Sept. 11, the Bush administration derided nation building as a Clinton-era distraction from the more important issues in international politics. Now, Bush has clearly identified the connection between rebuilding the failed state of Afghanistan and American national security interests. If Congress approves his proposals, Bush will be the author of the greatest increase in the American foreign aid budget since John F. Kennedy's presidency.

Third, the Bush administration before Sept. 11 expressed disdain for multilateral institutions. But in his speech this month before the United Nations, Bush outlined an ambitious proposal for revitalizing the United Nations and American cooperation with this most important multilateral institution.

To be credible, President Bush needs to do more to demonstrate his commitment to the promotion of democracy, nation building and multilateralism. Bush must show that he wants to see political reform in Saudi Arabia as well as in Iraq. Words about promoting liberty ring hollow if they apply only to some people.

To show seriousness on nation building, Bush should press for increases in the peacekeeping forces in Afghanistan. Those working to rebuild Afghanistan unanimously complain that the lack of security throughout the country is the No. 1 impediment to their work.

To make credible his pledge to reinvigorate the United Nations and other multilateral institutions, the president should complement his pledge to enforce U.N. resolutions on Iraq with a rededication of American participation in other international regimes. Bush could start with the ratification of the United Nations Convention on the Elimination of All Forms of Discrimination Against Women, an agreement that American officials helped craft.

Because many are suspicious of the president's recent embrace of democracy promotion, nation building and multilateralism, he must demonstrate a sustained commitment to his new foreign policy strategy.

If Bush has shown a willingness to consider new ideas about foreign policy, his critics -- both at home and abroad -- have demonstrated amazing conservatism. In a reversal of positions, those most opposed to Bush's new approach to foreign policy now seek to "preserve the peace" by defending the status quo. The core flaw in this is the assumption that the old international system was working. It was not.

Before Sept. 11, the United Nations had failed to enforce its own resolutions on Iraq. If the "international community" cannot act to execute its will when dealing with such grave issues as the proliferation of weapons of mass destruction, then it has no credibility on anything.

The international community is ineffective in dealing with despotism, poverty and human rights violations because it seeks to preserve state sovereignty above all else. Fifty years ago, this was a progressive idea, which brought about the end of colonialism. Today, it is a regressive idea, which preserves the sovereignty of dictators who defy international law, denying the sovereignty of their people.

It is odd to hear the international community invoked so often as the defender of high ideals and then see representatives from Iraq in the U.N. General Assembly. Should the United States really be a member of the same organization that includes Saddam Hussein? Eventually, autocracy should go the way of slavery and colonialism as simply unacceptable.

To be effective, the international community and the United States need each other. U.N. Security Council resolutions can only be enforced if the United States helps to enforce them. The United Nations can only assist in the building of new states or prevent the destruction of vulnerable regimes if the United States participates, and vice-versa. The international community has no army and no economy, but even the mighty and rich United States can't afford to remake the world alone. For an effective partnership, change has to come from both sides.

Michael McFaul is an associate professor of political science and Hoover Fellow at Stanford University and a senior associate at the Carnegie Endowment for International Peace.