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.

To make his case, [Bush] has a powerful historical experience to draw upon: the end of the Cold War. Regime change in Eastern Europe and the Soviet Union fundamentally enhanced American national security. If Iraq possessed Russia's nuclear arsenal today, the United States would be in grave danger. Two decades ago we feared this same arsenal in the hands of the Kremlin. Today we do not. The reason we do not is that the regime in Russia has become more democratic and market-oriented and therefore also more Western- oriented.

Second, democratization on the periphery of Europe has stalled. A dictator who praises Stalin and Hitler runs Belarus. President Vladimir Putin has weakened democratic institutions and grossly violated the human rights of his own citizens in Chechnya in his attempt to build "managed democracy" in Russia. In Ukraine, President Leonid Kuchma aspires to create the same level of state control over the democratic process as Putin has achieved in Russia to ensure a smooth -- that is, Kuchma-friendly -- transition of power when his term ends in 2004. In contrast to Russia, Ukraine has a vibrant democratic opposition, whose leader, Viktor Yushchenko, is likely to win a free and fair presidential election. This vote in 2004 will be free and fair, however, only if the West is watching. Only in Moldova has authoritarian creep been avoided, but that's because of the weakness of the state, hardly a condition conducive to long-term democratic consolidation.

The war in the Democratic Republic of the Congo (DRC), which began in August 1998, is unprecedented-at times involving armies from eight African states. Soldiers from Chad are fighting alongside regiments from Namibia, Angola, and Zimbabwe in defense of President Laurent Kabila. And on offense, the two main rebel groups, the Congolese Assembly for Democracy (which is known by the acronym RCD) and the Movement for the Liberation of Congo (MLC), are backed by troops from Uganda and Rwanda. As Susan E. Rice, assistant secretary of state for African affairs, warned the House International Relations Committee in September 1998, "The fighting threatens regional stability, hampers economic progress, endangers the lives of millions of people, perpetuates human rights abuses, and impedes the democratic transformation of Africa's third-largest country." This war, Rice said, is potentially "among the most dangerous conflicts on the globe."

Yet, the war in Congo goes on almost unnoticed outside of Africa. While African heads of state spent much of the last year shuttling across the continent, wrestling with the crisis and searching for a peaceful solution, Congo has been largely missing from the agendas of the Western powers and multilateral organizations. Only in January, when the U.S. representative to the United Nations, Richard Holbrooke, taking advantage of his tenure as Security Council president to draw attention to Africa, did the war enter Western consciousness.

The conflict in the DRC is the first interstate war in sub-Saharan Africa since Uganda invaded Tanzania in 1978, and only the third since 1960. Although Africa is seen as a hotbed of violence and warfare, most conflicts have been intrastate in nature. Norms of sovereignty reinforced by clauses in the charter of the Organization of African Unity (OAU) and the constitutions of the various subregional organizations have effectively prevented cross-border conflict from the time of independence until now. The Ugandan and Rwandan-led invasion of Congo, as well as the presence there of the Southern African Development Community (SADC) intervention force, therefore represents a watershed in the recent history of African conflict. It appears that the forces preventing cross-border conflict since 1960 have become seriously weakened.

What are the implications of the rise of interstate war in Africa for peace and security on the continent? Why have Western powers been so reluctant to take an active role in resolving Africa's first "world war"? And what impact will the changing nature of warfare in Africa have on U.S. policy and the role of the United Nations there?

The tasks of preventive diplomacy and conflict prevention are neither self-evident nor value-neutral, as some of their proponents seem to believe. Diplomacy that aims to resolve long-standing conflicts may have to take sides and coerce powerful parties into concessions. Diplomacy that aims to manage conflict so that it does not become violent may have to sacrifice a quest for justice in deference to the powerful. Prevention might conflict with important national and even global interests. If, as President Clinton has suggested many times, the primary American interest in Bosnia is thwarting the spread of the war, then the arms embargo has been an unqualified success. If, however, the primary American and global interest has been denying Serbian aggression and upholding the principle of Bosnian sovereignty, then the embargo has failed.

A focus on prevention ignores the role that conflict plays in driving political change in societies. For grievances to be redressed, they must be vocalized. If they are vocalized, those with a stake in the status quo will attempt to suppress them. Often the balance of change depends on the ability of the grieved to amplify the conflict to increase their support. If we have learned anything from the disparate cases of conflict resolution in recent decades -- the civil rights movement in the United States, the fight for human rights in Eastern Europe and the former Soviet Union, the fight for national self-determination in the Middle East, the fight against apartheid in South Africa -- it is that some conflicts must be intensified before they are resolved.

Preventive diplomacy and conflict prevention do not lessen the difficulty of choices for leaders, nor do they really lessen costs. For either to succeed, policymakers must still spell out their interests, set priorities among cases, and balance goals with resources. The president will still need to educate the American people about the rationale behind a policy and convince them of the need for action. Absent well-defined interests, clear goals, and prudent judgment about acceptable costs and risks, policies of preventive diplomacy and conflict prevention simply mean that one founders early in a crisis instead of later.