Earlier this month, the so-called EU Three--Britain, France and Germany-- achieved an important victory for global security, convincing Iran to suspend its uranium enrichment and plutonium reprocessing activities pending further negotiation on its nuclear question. Though Iran claims that it does not desire a nuclear bomb, the West has long been skeptical of the oil-rich state's contention that it seeks a nuclear fuel cycle for energy purposes alone. Europe and the United States (and of course Israel) will sleep better knowing that Tehran is not pursuing enrichment activities, whatever their alleged purpose.

But the EU3 agreement, which fails to discuss consequences for Iran if it breaks the deal, is vulnerable to being undermined not only by Iran but also by the United States; both have already raised eyebrows in the wake of the accord. Iran raced to produce uranium hexafluoride, a gas that can be enriched into bomb fuel, before it began to observe the temporary suspension on Monday. And both President George W. Bush and outgoing Secretary of State Colin Powell have publicly aired their suspicions that Iran will continue its drive for nuclear weapons under cover of the deal.

At the moment, administration hawks are pressing to confront the mullahs at the United Nations Security Council, where economic sanctions could be considered; calls for using force and for regime change are likely to follow.

Military action is inadvisable at this point, because of a dearth of solid intelligence and the secretive, geographically diffuse nature of Iran's nuclear sites. If the issue reaches the Security Council with the United States and Europe continuing along divergent paths, the inevitable deadlock will deal a severe and lasting blow to international security. Therefore, the agreement must be fortified to keep the Iranians honest, the Europeans effectively engaged and the U.S. hawks bridled.

This can be achieved through a U.S.-European accord laying out trigger mechanisms for specified consequences if Iran violates certain benchmarks. For example, if Iran fails to allow inspectors the access accorded by the Nuclear Nonproliferation Treaty's additional protocol--which Iran is provisionally observing pending ratification--or resumes enrichment and centrifuge-building activities, it could face severe economic sanctions, censure by the Security Council (necessitating cooperation from Russia and China), or in the event of hostility, a forceful response.

We don't know yet whether Tehran will play by the rules. The regime has mastered the art of behaving badly and then seeking rewards for getting back into line. To date, the Europeans have played into its hands, offering carrots for compliance without wielding sticks to punish violations.

Therefore, the Bush administration's apparent comfort with a military option can serve as an important deterrent against Iranian cheating, arming the EU3 agreement with teeth that it would not otherwise have. Iran desires economic incentives but does not yet desperately need them; without a credible threat of U.S.-backed sanctions imposed by the international community, the mullahs can simply decide one day that the restrictions have ceased to be worth their while, and break any deal as though it were merely a business contract.

For the United States, accepting the EU3's carrot-based approach (provided the benchmarks are added) will show the world that it still supports negotiated diplomacy and multilateralism, even in cases where military threats loom. Participating in this framework will also send a message to Iran that the United States is not ruling out renewed relations. This would resonate with the largely pro-American Iranian populace, who despise their regime and are seeking inroads to break free of it.

But if the United States instead presents itself as a unilateralist maverick, it will hinder its own interests; the only thing Iranians disdain more than the mullahs is outside meddling with their deeply nationalistic desire for self-determination. The more overtly hostile the United States acts toward Iran, the more the mullahs are able to spin America's posture to alienate Iranians against the "Great Satan."

The way to keep the Iranian regime in check while speeding its demise is to insure the nuclear agreement through benchmarks and triggers, and then give the mullahs exactly what they ask for in terms of increased access to international institutions like the World Trade Organization.

Such carrots can also be Trojan Horses, allowing the forces of democratic reform within Iran to blossom by enabling pro-democracy elements to make global connections. The U.S. and Europe should saddle up those horses together.

Faced with the deadly menace posed by transnational terror organizations, the nations of the world must redouble their cooperative efforts. The tasks ahead -- to disrupt terror groups and preempt their attacks -- require intense coordination among a multitude of national intelligence, national law enforcement, and military organizations. Unprecedented cooperation among all of the nuclear powers is needed to prevent nuclear weapons from falling into the hands of terror groups.

Yet, paradoxically, the two nations that have suffered the worst terror attacks -- the United States and Russia -- are regressing more and more to national strategies. They have been unwilling to make the extra effort to reap the benefits of real international cooperation.

I believe that the United States' strategic vision of the war on terrorism is flawed. I fear it is following the isolationist path of the United States after World War I rather than pursuing the broad international programs it successfully undertook to protect its security interests after World War II.

The terrorists posing the greatest threat to the United States and to Russia are transnational, with cells in many different countries. To support their training and operations, they raise funds in many countries and maintain these in international bank accounts. They use satellite-based television as their principal means of propaganda, the World Wide Web as their principal means of communication and international airlines as their principal means of transportation. Their efforts to get weapons of mass destruction are based on penetrating the weakest security links among the nations possessing these weapons, and their successful guerrilla operations depend on their ability to get support from sympathizers among the more than 1 billion Islamic people around the world.

An international operation is clearly needed to successfully deal with this threat. But the United States is not making full use of other nations and international institutions to dry up the terrorists' funds in international bank accounts, to gain intelligence on their planning for future attacks, to penetrate their cells so that it has a chance of preempting these attacks, to organize all nuclear powers with effective security of their nuclear weapons and fissile material, and to conduct counterinsurgency operations wherever they are needed. Dealing effectively with transnational terror groups that operate with impunity across borders requires an international operation with the full cooperation of allies and partners in Europe and Asia.

This is not "mission impossible." In 1993, the United States was able to get all of the former members of the Warsaw Pact to join up with NATO in forming the Partnership for Peace to cooperate in peacekeeping operations. In 1994, the United States with the full cooperation of Russia was able to negotiate an agreement by which all nuclear weapons were removed from Uzbekistan, Belarus and Kazakhstan and by which substantial improvements were made in the security of nuclear weapons in Russia. In 1995, the United States was able to get an agreement under which NATO took responsibility for the peacekeeping operations in Bosnia, an operation that was believed at the time to be as dangerous and filled with religious and sectarian strife as Iraq today, and it was able to get dozens of non-NATO nations -- notably including Russia -- to join it in that operation.

Securing Russian cooperation required listening to Russian views and making accommodations wherever possible. As U.S. defense secretary, I had to meet with my Russian counterpart four different times before I came to understand how to structure the command in Bosnia in a way acceptable to both Russians and NATO. The general lesson from this example, which is still applicable today, was best expressed by Winston Churchill, who observed during World War II, "The problem with allies is they sometimes have ideas of their own." But in reflecting on that problem, he also said, "The only thing worse than fighting a war with allies is trying to fight a war without allies."

What lessons can we learn from Churchill today? Had the Bush administration understood better the dangers of the post-conflict phase, surely it would have worked harder to get the support of those countries before invading Iraq. In any event, after the war it would have reached out to them and tried to achieve an accommodation that would have allowed their support during the reconstruction phase.

Instead, the administration took the position that any nation that was not with the United States during the war would not have a role in the reconstruction. To compound the problem, the United States did not seek meaningful assistance from the United Nations. Today, in the light of the difficulties experienced in restoring security in Iraq, the administration is reaching out to the United Nations and requesting that it play a major role in the political reconstitution of Iraq, but it is still not working effectively with the governments of France, Germany and Russia.

Just as the United States erred in believing that it did not need more international support in Iraq, so did the Russian government err in believing that it did not need more international support as it reconstituted its government after the Soviet era. The Putin administration believed -- correctly -- that it could turn around the Russian economy without significant assistance from other countries, and it believed that it could deal most effectively with its terrorist threat without interference from other countries. It also apparently believed that moving toward a level of democracy conflicted with the controls necessary for economic recovery and for fighting its terror war. So today we see a Russia that has enjoyed a healthy 7 percent growth rate each of these past five years, but has stopped -- indeed reversed -- its move towards becoming a liberal democracy. This reversal over the long term will have profoundly negative consequences for the Russian economy and for the Russian people, and unquestionably it is setting Russia on a course that will alienate it both from the United States and the European Union.

Both the Bush administration and the Putin administration have apparently made the decision that they can achieve their goals without broad international support. Both governments have erred in that judgment. But it is not too late to correct the judgment, and I fervently hope that both of governments will do so. The most important step in that process is reviving cooperation between the United States and Russia.

Stephen Stedman, senior fellow at the Stanford Institute for International Studies (SIIS), has been appointed research director for the United Nations' new High-Level Panel on Threats, Challenges and Change. Stedman will leave for New York City next month for the remainder of the academic year.

On Nov. 4, U.N. Secretary General Kofi Annan appointed Stedman and 16 members of the blue-ribbon commission, which is chaired by Thailand's former Prime Minister Anand Panyarachun. The panel is charged with examining current global threats and analyzing future challenges to international peace and security. The group will not formulate policies on specific issues or on the United Nations' role in specific places, but it will advise the organization on reforms necessary to cope with emerging challenges. The panel will complete a 10,000- to 15,000-word report by late next year.

Stedman, a senior fellow at the Center for International Security and Cooperation (CISAC) at SIIS, has served as a consultant to the United Nations on issues of peacekeeping in civil war, light weapons proliferation and conflict in Africa, and preventive diplomacy. His most recent co-authored publications include Ending Civil Wars: The Implementation of Peace Agreements (2002) and Refugee Manipulation: War, Politics and the Abuse of Human Suffering (2003).

Asked about the genesis of his new appointment, Stedman said he has developed relations with a set of people at the United Nations during the last six years. "A lot of the work I've done has had resonance in the U.N.," he said. "Policymakers read it and they understand I have sympathy for people who have to make tough decisions."

CISAC co-director Scott Sagan said the appointment is a "great tribute to the quality and policy relevance of the work that Steve has done over his career."

Stedman said his biggest challenge will be producing a report "that is both hard-hitting and has the potential for leading to change. There is a general sense within the U.N. that, basically, the effectiveness and legitimacy of the organization has been called into account. When Kofi Annan announced his intention to create the panel, he declared that the U.N. was at a crossroads where it needed to rethink how it can effectively provide collective security in today's world."

In addition to Panyarachun, the panel members include such international policy figures as former Norwegian Prime Minister Gro Harlem Brundtland; former Australian Minister of Foreign Affairs Gareth Evans; former U.N. High Commissioner for Refugees Sadako Ogata of Japan; former Russian Prime Minister Yevgeny Primakov; and retired U.S. Lt. Gen. Brent Scowcroft, former national security adviser.