Amid uncertainty over the outcome of the six-party negotiations on North Korea's nuclear weapons development, public concern is likely to focus on whether Pyongyang will live up to commitments it made to dismantle its nuclear weapons programme (already questionable) and whether it will pursue long-range nuclear missiles that could destroy an American city or, more immediately, Seoul and Tokyo. But the latter concern is not the most effective nuclear threat North Korea or other potential adversaries could pose.

A nuclear threat to American cities, if implemented, would certainly provoke massive US retaliation. There are better options for opponents: credible, cheaper and more suited to the US capabilities that adversaries would face. Since the cold war, the top US military priority, as stated in congressional testimonies, has been to deploy the world's most effective power projection forces. These forces have been used in the Balkans, the Persian Gulf and central Asia. A power projection force operates in or near hostile territory. It must rely on superior training, tactics and equipment. Joint force training, mobile communication and control, soldiers capable of individual initiative and precision-guided munitions have been key to US success.

Any power projection force needs air bases and ports of debarkation and logistics centres for sustained operations. These facilities must be rented or conquered. Their number is limited - a handful in Iraq, and not many more in east Asia, seven or so in Japan, some bases in South Korea, and a few others. These facilities are highly vulnerable even to inaccurate nuclear missile attacks. They are "soft targets", not "hardened" against nuclear weapons.

North Korea, with a couple of dozen warheads mounted on its intermediate-range No Dong missiles, or its longer-range Taepo Dong missiles, could threaten all the US assets mentioned above and have weapons left to threaten Tokyo and Seoul.

The US could destroy those North Korean military and nuclear assets it could locate. North Korean forces could retreat into the mountains and position for a protracted ground war. But would the US then launch a massive attack against North Korea with the threat still hanging over Japanese and South Korean cities?

The Pentagon's Quadrennial Defense Review envisages a force structure better suited to counter-terrorism and control of the seas and the sky, rather than focused on fighting two land wars simultaneously. The nuclear threat to essential US force-projection assets largely counterbalances the advantage provided by US conventional forces, without necessarily consigning whole cities and industrial bases to destruction. That latter threat can still be held in reserve by our adversaries.

Should this threat mature, it would undercut the credibility of US security guarantees in east Asia that have been the hallmark of US strategy in the region for more than half a century. Japan, South Korea and Taiwan all depend heavily on these guarantees for their security. This credibility has dissuaded each government from acquiring its own nuclear force. Such restraint, in turn, has permitted China to proceed at a more measured pace in its own nuclear weapons development programmes.

If key political and defence officials in Tokyo, Seoul and Taipei no longer believed in US guarantees because of the vulnerability of US military assets in the region to a North Korean nuclear missile attack, the consequences for their own security and for US national strategy could be profound. Although circumstances are quite different in the Middle East-Persian Gulf region, similar consequences could materialise if Iran or another hostile country developed a comparable nuclear missile capability.

A great deal is at stake in constraining the missile and nuclear weapons capabilities of North Korea and other rogue states. The US thus must utilise all the resources at its disposal, working constructively with its allies and other interested parties, to deny these states the capabilities they almost surely seek to acquire. A more resilient forward defence and deterrent posture is essential to an effective American global strategy.

A new united nations report recommending the most sweeping reform in the institution's history offers a global vision of collective security for the 21st century that is as committed to development in poor nations as it is to prevention of nuclear terrorism in rich ones.

The point is, according to the report's research director, Stephen Stedman, a threat to one is a threat to all in today's world. "Globalization means that a major terrorist attack anywhere in the industrial world would have devastating consequences for the well-being of millions around the developing world," the document states. The report's value lies in putting forward a comparative framework of collective security that addresses all the compelling threats of the day, Stedman explained. "The recommendations really are the most important possible makeover of the institution in 60 years," he said. "I think something is going to come out of it." Stedman, a senior fellow at the Center for International Security and Cooperation (CISAC) at the Stanford Institute for International Studies (SIIS), was recruited a year ago by U.N. Secretary General Kofi Annan to direct research for the High-Level Panel on Threats, Challenges, and Change. Stedman is an expert on civil wars, mediation, conflict prevention, and peacekeeping.

Annan created the 16-member blue-ribbon panel, made up mostly of former government leaders and ministers, in the wake of widespread heated criticism of the United Nations following the U.S.-led war in Iraq. In Annan's annual report to the General Assembly in 2003, he said, "Rarely have such dire forecasts been made about the U.N. ... We have reached a fork in the road ... a moment no less decisive than 1945 itself, when the U.N. was founded." The panel was charged with analyzing global security threats and proposing far-reaching reforms to the international system.

On December 2 the panel, chaired by former Thai prime minister Anand Panyarachun, issued its 95-page report: "A More Secure World: Our Shared Responsibility." The document identifies six major threats to global security:

-War between states;

-Violence within states, including civil wars, large-scale human rights abuses, and genocide;

-Poverty, infectious disease, and environmental degradation;

-Nuclear, radiological, chemical, and biological weapons;

-Terrorism; and

-Transnational organized crime.

Although states do not face these threats equally, a collective security system must take all member states' threats seriously and deal with them equitably, the report noted. It specifically mentioned the world's appallingly slow response to AIDS.

The report makes 101 recommendations for collective prevention and response to the threats, including ways to reform the United Nations. Annan described these in a December 3 editorial in the International Herald Tribune as "the most comprehensive and coherent set of proposals for forging a common response to common threats that I have seen."

The document also reaffirms the right of states to defend themselves-even preemptively-when an attack is imminent, and it offers guidelines to help the Security Council decide when to authorize the use of force. Stedman said other significant proposals involve improving biosecurity, strengthening nuclear nonproliferation, and defining terrorism. Panel members agreed that any politically motivated violence against civilians should be regarded as terrorism and condemned.

The panel was very critical of the Human Rights Commission, a body that has often harmed the United Nations' reputation by permitting the membership of some of the worst human-rights violators, including Cuba, Libya, and Sudan. The report also discussed the need for new institutions, such as a peace-building commission, that would support countries emerging from conflict.

Scott Sagan, co-director of CISAC, described the report as hard-hitting, although he said he would have tried to extend the withdrawal clause of the nonproliferation treaty from three months to a year. "I think it's the beginning of some major changes that will be helpful," he said. "We need to get states to work together to reform the U.N. rather than sniping at it."

CISAC was closely involved in the panel's work and was named in a cover letter accompanying the report from Panyarachun to Annan. Co-director Chris Chyba served on the panel's 30-member resource group, providing expertise on nuclear nonproliferation and bioterrorism. Bruce Jones, a former CISAC Hamburg Fellow, acted as Stedman's deputy, and Tarun Chhabra, a graduate of CISAC's undergraduate honors program and recent Marshall Scholarship recipient, worked as a research officer. Political science Professors David Laitin and James Fearon, and SIIS Senior Fellow David Victor, provided, respectively, expertise on terrorism, civil wars, and the environment, Stedman said. "There is an immense amount of Stanford influence in the report," he added.

CISAC also hosted a nuclear nonproliferation workshop for the panel on campus last March and helped organize a meeting during the summer in Bangkok. SIIS co-hosted a conference on governance and sovereignty on campus in April and a meeting at Oxford University in June. CISAC provided workspace to give the research team a quiet place to focus on writing the report's first draft in August.

The report has attracted intense international media interest in part because it calls for expanding the U.N. Security Council, its top decision-making group, from 15 to 24 members. The panel was unable to agree on one proposal and offers two options that would make the council more representative and democratic. "I believe either formula would strengthen the legitimacy in the eyes of the world, by bringing its membership closer to the realities of the 21st century-as opposed to those of 1945, when the U.N. Charter was drafted," Annan wrote in the International Herald Tribune.

According to Stedman, the media has highlighted the Security Council's proposed expansion because so many nations have a stake in it. "But in the absence of a new consensus on international peace and security, expansion of the council will not be effective," he explained.

In March, Annan will use the report to inform a series of proposals he will present to the 191 U.N. member states. These, in turn, will be submitted to a summit of world leaders before the General Assembly convenes next September in New York. Stedman said he has been asked to stay on for another year as a special advisor to the secretary general to keep the United Nations "on message" during negotiations.

Engagement by the United States, which has openly questioned the institution's relevance, will be critical to implementing the report's recommendations, said Stedman, who added that the superpower can benefit from a revamped United Nations. "Putting threats to the United States into a global framework makes it more secure," he said.

Stedman noted that one of the most disturbing aspects of the panel's consultations was listening to government representatives from civil-society organizations dismiss the seriousness of bio- and nuclear terror threats against the United States. "They were essentially denying this as a real threat to American security," he said. "I said it's as real a threat to the U.S. as other threats are to you."

When Stedman accepted the job, he thought he would spend 80 percent of his time on research and writing and 20 percent on consultations and negotiating. In fact, he said, it was the other way around. "It's unlike anything I've ever done," he said. "It's been a blast." In contrast to academia, where a researcher presents his or her best findings and defends them, Stedman was faced with 16 people who would push back, reject, or accept his work. "I had to work to change language to include their concerns," he said. "My biggest concern at the beginning was that the report would be based on the lowest common denominator. It's not."

Stedman said the panel members remained open-minded throughout the year. "They showed flexibility, listened to arguments, and changed their minds," he said. "Our job was to be as persuasive, rigorous, and comprehensive in our analysis as we were able to achieve."

In the end, Stedman said, the report belongs to the panel. "Parts of what the exercise shows is that access to those making policy is really important," he said. "If you do really good work and you have access, you have a chance of being heard. Kofi Annan gave me that opportunity."