Nuclear Risk

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The Caroline S.G. Munro Professor of Political Science
The Bass University Fellow in Undergraduate Education  
Senior Fellow, Freeman Spogli Institute for International Studies
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Scott D. Sagan is Co-Director and Senior Fellow at the Center for International Security and Cooperation, the Caroline S.G. Munro Professor of Political Science, and the Bass University Fellow in Undergraduate Education at Stanford University. He also serves as Co-Chair of the American Academy of Arts and Sciences’ Committee on International Security Studies. Before joining the Stanford faculty, Sagan was a lecturer in the Department of Government at Harvard University and served as special assistant to the director of the Organization of the Joint Chiefs of Staff in the Pentagon.

Sagan is the author of Moving Targets: Nuclear Strategy and National Security (Princeton University Press, 1989); The Limits of Safety: Organizations, Accidents, and Nuclear Weapons (Princeton University Press, 1993); and, with co-author Kenneth N. Waltz, The Spread of Nuclear Weapons: An Enduring Debate (W.W. Norton, 2012). He is the co-editor of Insider Threats (Cornell University Press, 2017) with Matthew Bunn; and co-editor of The Fragile Balance of Terror (Cornell University Press, 2022) with Vipin Narang. Sagan was also the guest editor of a two-volume special issue of DaedalusEthics, Technology, and War (Fall 2016) and The Changing Rules of War (Winter 2017).

Recent publications include “Creeds and Contestation: How US Nuclear and Legal Doctrine Influence Each Other,” with Janina Dill, in a special issue of Security Studies (December 2025); “Kettles of Hawks: Public Opinion on the Nuclear Taboo and Noncombatant Immunity in the United States, United Kingdom, France, and Israel”, with Janina Dill and Benjamin A. Valentino in Security Studies (February 2022); “The Rule of Law and the Role of Strategy in U.S. Nuclear Doctrine” with Allen S. Weiner in International Security (Spring 2021); “Does the Noncombatant Immunity Norm Have Stopping Power?” with Benjamin A. Valentino in International Security (Fall 2020); and “Just War and Unjust Soldiers: American Public Opinion on the Moral Equality of Combatants” and “On Reciprocity, Revenge, and Replication: A Rejoinder to Walzer, McMahan, and Keohane” with Benjamin A. Valentino in Ethics & International Affairs (Winter 2019).

In 2022, Sagan was awarded Thérèse Delpech Memorial Award from the Carnegie Endowment for International Peace at their International Nuclear Policy Conference. In 2017, he received the International Studies Association’s Susan Strange Award which recognizes the scholar whose “singular intellect, assertiveness, and insight most challenge conventional wisdom and intellectual and organizational complacency" in the international studies community. Sagan was also the recipient of the National Academy of Sciences William and Katherine Estes Award in 2015, for his work addressing the risks of nuclear weapons and the causes of nuclear proliferation. The award, which is granted triennially, recognizes “research in any field of cognitive or behavioral science that advances understanding of issues relating to the risk of nuclear war.” In 2013, Sagan received the International Studies Association's International Security Studies Section Distinguished Scholar Award. He has also won four teaching awards: Stanford’s 1998-99 Dean’s Award for Distinguished Teaching; Stanford's 1996 Hoagland Prize for Undergraduate Teaching; the International Studies Association’s 2008 Innovative Teaching Award; and the Monterey Institute for International Studies’ Nonproliferation Education Award in 2009.     

Co-director of the Center for International Security and Cooperation
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Lynn Eden is a Senior Research Scholar Emeritus. She was a Senior Research Scholar at Stanford University's Center for International Security and Cooperation until January 2016, as well as was Associate Director for Research. Eden received her Ph.D. in sociology from the University of Michigan, held several pre- and post-doctoral fellowships, and taught in the history department at Carnegie Mellon before coming to Stanford.

In the area of international security, Eden has focused on U.S. foreign and military policy, arms control, the social construction of science and technology, and organizational issues regarding nuclear policy and homeland security. She co-edited, with Steven E. Miller, Nuclear Arguments: Understanding the Strategic Nuclear Arms and Arms Control Debates (Ithaca, N.Y.: Cornell University Press, 1989). She was an editor of The Oxford Companion to American Military History (New York: Oxford University Press, 2000), which takes a social and cultural perspective on war and peace in U.S. history. That volume was chosen as a Main Selection of the History Book Club.

Eden's book Whole World on Fire: Organizations, Knowledge, and Nuclear Weapons Devastation (Ithaca: Cornell University Press, 2004; New Delhi: Manas Publications, 2004) explores how and why the U.S. government--from World War II to the present--has greatly underestimated the damage caused by nuclear weapons by failing to predict damage from firestorms. It shows how well-funded and highly professional organizations, by focusing on what they do well and systematically excluding what they don't, may build a poor representation of the world--a self-reinforcing fallacy that can have serious consequences, from the sinking of the Titanic to not predicting the vulnerability of the World Trade Center to burning jet fuel. Whole World on Fire won the American Sociological Association's 2004 Robert K. Merton Award for best book in science, knowledge, and technology.

Eden has also written on life in small-town America. Her first book, Crisis in Watertown (Ann Arbor: University of Michigan Press, 1972), was her college senior thesis; it was a finalist for a National Book Award in 1973. Her second book, Witness in Philadelphia, with Florence Mars (Baton Rouge: Louisiana State University Press, 1977), about the murders of civil rights workers Schwerner, Chaney, and Goodman in the summer of 1964, was a Book of the Month Club Alternate Selection.

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After a brief period of progress, the U.S.-Russian nuclear reduction process has reached a stalemate. This situation causes us to rethink the following issues:

- What is the motivation for the two nuclear superpowers to conduct nuclear reductions?

- How can the focus of the nuclear arms reduction process be changed from verification of reduction of delivery vehicles to verification of reduction of warheads and nuclear materials?

- What is the objective for future nuclear reductions?

- What kind of verification regime will be required for future nuclear reductions?

This paper addresses each of these questions in some detail.

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The Cox Commission of the U.S. Congress was established in June 1998 to investigate concerns over Chinese acquisition of sensitive U.S. missile and space technology in connection with the launching of U.S. civilian satellites using Chinese launchers on Chinese territory. The investigations were broadened in October 1998 to include alleged security problems and possible espionage at the U.S. nuclear weapons laboratories. Some conclusions were released in January 1999 by the White House together with the administration's response. The full declassified (redacted) version of the report of the Cox Commission was released on May 25, 1999.

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The U.S. Senate's rejection of the CTBT in October 1999 does not free the United States from the Treaty's norm against nuclear-weapon test explosions. Nor does it mean that the Senate will never approve the Treaty. But it does mean that the final U.S. position on the Treaty almost certainly will not be known until after the next U.S. presidential election in November 2000. Moreover, a debate to build domestic and international support for U.S. adherence to the Treaty's norm could help to produce eventual Senate approval.

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Disarmament Diplomacy
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The nuclear nonproliferation regime was challenged in 1998 by nuclear-weapon tests in India and Pakistan, by medium-range missile tests in those countries and in Iran and North Korea, by Iraq's defiance of UN Security Council resolutions requiring it to complete its disclosure of efforts to acquire weapons of mass destruction, and by the combination of "loose nukes" and economic collapse in Russia. Additional threats to the regime's vitality came in 1999 from the erosion of American relations with both China and Russia that resulted from NATO's 1999 bombing of Yugoslavia--with additional harm to relations with China resulting from U.S. accusations of Chinese nuclear espionage and Taiwan's announcement that it was a state separate from China despite its earlier acceptance of a U.S.-Chinese "one China" agreement. Major threats to the regime also came from the continued stalemate on arms-control treaties in the Russian Duma and the U.S. Senate, from a change in U.S. policy to favor building a national defense against missile attack, and from a Russian decision to develop a new generation of small tactical nuclear weapons for defense against conventional attack.

This paper will discuss the effect some of these developments had on the 1999 Preparatory Committee (PrepCom) meeting of Non-Proliferation Treaty (NPT) parties to prepare for review of the NPT in 2000, and speculate about their likely future effect on the regime.

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The decade of the 1990s has seen renewed concerns over nuclear proliferation, both horizontal and vertical. While many in the arms control community focus on numbers, it is control that is the most important factor--the detonation of just one nuclear weapon would be an international catastrophe. Rather than concentrating on numbers, the regime defined herein centers on enhancing the safety and security being provided nuclear weapons and weapons-usable fissile materials. The proposal in the paper is called the Nuclear Weapons Control Treaty (NWCT) and referred to as New Court. The emphasis is on control rather than disarmament, protection from unintended or unauthorized use rather than elimination. New Court, once in place, would provide an environment in which the necessary audits and accountability for undertaking dramatic reductions in the numbers of weapons and the quantities of weapons-usable materials could be made with much greater confidence than exists today. However, it will be decades (if ever) before the number of nuclear weapons goes to zero. In the meantime, it is paramount that comprehensive safety and security be established and maintained.

There are currently more than a thousand metric tons of civilian fuel cycle plutonium, mostly in spent fuel rods, but hundreds of tons are already separated and in storage. Any of this plutonium could be fashioned into a nuclear explosive. There are no practical approaches for disposing of plutonium in periods of time less than decades. Much of the architecture and technology from New Court can be applied to the development of international monitored storage facilities (IMSF) for civil nuclear material. The paper outlines the five key requirements an international depository must satisfy: national security for the depositors and the host nation; safety and security of the material; transparency of operations; technology transfer to provide uniform global protection; and precise accurate accountability of the quantities and forms of material deposited. The synergism and conflict among the factors is briefly described. The paper also contains annexes on the current status of some key monitoring technologies and a description of an international "stored weapons standard" for protecting weapons-usable fissile material.

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Can the current global moratorium on nuclear weapon testing survive the May 1998 tests by India and Pakistan and the refusal of US Senate leaders to permit consideration of the Comprehensive Test Ban treaty (CTBT) by the Senate? If nuclear testing resumes by India or Pakistan - or by Britain, China, France, Russia, or the United States - will it be condemned by most of the world as if an international norm against testing was already in effect? What will be the likely consequences for nonproliferation if tests resume? This article seeks to show that there are norms operating against nuclear testing even though the CTBT has not been ratified, and that renewal of testing would have widespread consequences.

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The Nonproliferation Review
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