SEEKING THE BOMB Princeton Studies in International History and Politics G. John Ikenberry, Marc Trachtenberg, William C. Wohlforth, and Keren Yarhi-Milo, Series Editors For a full list of titles in the series, go to https://press.princeton.edu/series/princeton -studies-in-international-history-and-politics Seeking the Bomb: Strategies of Nuclear Proliferation, Vipin Narang The Spectre of War: International Communism and the Origins of World War II, Jonathan Haslam Active Defense: China’s Military Strategy since 1949, M. Taylor Fravel Strategic Instincts: The Adaptive Advantages of Cognitive Biases in International Politics, Dominic D. P. Johnson Divided Armies: Inequality and Battlefield Performance in Modern War, Jason Lyall After Victory: Institutions, Strategic Restraint, and the Rebuilding of Order after Major Wars, New Edition, G. John Ikenberry Cult of the Irrelevant: The Waning Influence of Social Science on National Security, Michael C. Desch Secret Wars: Covert Conflict in International Politics, Austin Carson Who Fights for Reputation: The Psychology of Leaders in International Conflict, Keren Yarhi-Milo Aftershocks: Great Powers and Domestic Reforms in the Twentieth Century, Seva Gunitsky Why Wilson Matters: The Origin of American Liberal Internationalism and Its Crisis Today, Tony Smith Powerplay: The Origins of the American Alliance System in Asia, Victor D. Cha Economic Interdependence and War, Dale C. Copeland Knowing the Adversary: Leaders, Intelligence, and Assessment of Intentions in International Relations, Keren Yarhi-Milo Seeking the Bomb Strategies of Nuclear Proliferation Vipin Narang PRINCETON UNIVERSITY PRESS PRINCETON AND OXFORD Copyright © 2022 by Princeton University Press Princeton University Press is committed to the protection of copyright and the intellectual property our authors entrust to us. Copyright promotes the progress and integrity of knowledge. Thank you for supporting free speech and the global exchange of ideas by purchasing an authorized edition of this book. If you wish to reproduce or distribute any part of it in any form, please obtain permission. Requests for permission to reproduce material from this work should be sent to [email protected]. Published by Princeton University Press 41 William Street, Princeton, New Jersey 08540 6 Oxford Street, Woodstock, Oxfordshire OX20 1TR press.princeton.edu All Rights Reserved ISBN 978-0-691- 17261-3 ISBN (pbk.) 978-0-691-17262-0 ISBN (e-book) 978-0-691-22306-3 British Library Cataloging-in-Publication Data is available Editorial: Bridget Flannery-McCoy and Alena Chekanov Production Editorial: Jenny Wolkowicki Cover design: Lauren Smith Production: Erin Suydam Publicity: Kate Hensley and Kathryn Stevens Cover image by Mike Wagnon. Courtesy of Eleanor Hansen This book has been composed in Adobe Text Pro and Gotham Printed on acid-free paper. ∞ Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 CONTENTS Illustrations vii Acknowledgments ix 1 Introduction 1 2 Strategies of Nuclear Proliferation and Their Sources 15 3 The Varieties of Hedgers: India, Japan, West Germany, Brazil and Argentina, Sweden and Switzerland 53 4 The Sprinters: Soviet Union, France, and China 127 5 The Sheltered Pursuers: Israel, Pakistan, and North Korea 176 6 The Hiders: Iraq, Taiwan, and South Africa 236 7 The Consequences for Nuclear Proliferation and Conflict: Halting Hedgers and Handling Hiders (Libya, Syria, and Iran) 292 8 Conclusion 338 Bibliography 353 Index 369 v ILLUSTRATIONS Figures 1.1. Windows of Volatility 11 2.1. Proliferation Strategy Theory 28 2.2. Strategies of Nuclear Proliferation Over Time 44 3.1. Proliferation Strategy Theory’s Varieties of Hedging 55 3.2. Uranium Enrichment Curve via Centrifuges 105 4.1. Proliferation Strategy Theory’s Pathway to Sprinting 128 5.1. Proliferation Strategy Theory’s Pathway to the Sheltered Pursuit Strategy 177 6.1. Proliferation Strategy Theory’s Pathway to a Hiding Strategy 238 8.1. Proliferation Strategy Theory 346 Tables 2.1. Indicators for the Varieties of Hedging 20 2.2. Typology of the Strategies of Nuclear Proliferation 25 2.3. Measuring Domestic Political Consensus 34 2.4. Empirical Codings of Strategies of Nuclear Proliferation 42 8.1. Empirical Codings of Strategies of Nuclear Proliferation 348 vii ACKNOWLEDGMENTS The germ for this book was planted when I was an undergraduate chemical engineer at Stanford who was broadly interested in international security affairs, and it was, perhaps fittingly, completed amid a full-blown global pandemic. In my first year of college, India and Pakistan tested nuclear weapons. As I was leaving the Bay Area several years later, the United States was preparing to invade Iraq, in part due to suspicions of a clandestine nuclear weapons program. Nuclear weapons proliferation is largely what drove me to switch careers and devote my life to studying international security, with the incredible encouragement of my two most supportive gurus at Stanford: Scott Sagan and Taylor Fravel. Scott took a chance on this curious chemical engineer and invited me into the CISAC family, which is the real Hotel California: even when you check out, you never really leave. Scott has been a source of unwavering support over almost two decades who not only has been an incredible guide and friend but has served as a role model in how to do first-rate scholarship, how to be a sup- portive (and sometimes necessarily tough) mentor, and how to do it with unimpeachable integrity. I can never repay Scott for all that he has done for me; I can only hope that I can pay a fraction of it forward to my own students. Taylor and I reunited at MIT after I finished my doctorate and is my partner in crime at the Security Studies Program. We have battled travel systems, fundraising, classes, administrative bureaucracy, bulk wine orders, and life together. There is no one with whom I would rather be in the trenches fighting this fight. No two people are more responsible for this book than Scott and Taylor. You can blame them. Those that wanted me to go to medical school still do. Along the way, Yuen Foong Khong, Stephen Rosen, and Iain Johnston encouraged me to not abandon my passion for nuclear security when pretty much everyone around me was telling me it was a dying field. Steve indelibly left a line in my head that I have never forgotten: so long as nuclear weapons continue to exist, we need people to study them. ix x!ACKNOWLEDGMENTS Although my first book was about strategies of nuclear deterrence, this book returns to my roots and focuses on strategies of nuclear proliferation. When I got into this business, the bulk of the literature on nuclear prolifera- tion focused on why states such as India, Pakistan, and Iraq might want to seek nuclear weapons. By the time I finished my first book, I was struck that no one had yet asked how these states went about pursuing nuclear weapons and why those choices mattered. Why did India take a quarter century to decide to finally weaponize its nuclear deterrent? How did Pakistan escape American pressure to terminate its nuclear program? And of course, Iraq’s (failed) clandestine pursuit of nuclear weapons in the 1980s set the stage for a seismic reordering of Middle East politics in 2003. This is a book about the various ways in which states seek nuclear weapons, why those choices are important, and how they may be managed or stopped. Many people helped along the way, and I apologize if I have inadvertently forgotten anyone. MIT’s Department of Political Science and Security Studies Program have been the ideal intellectual home for my academic career, and this book. In addition to Taylor, Dick Samuels, Roger Petersen, Steve Van Evera, and Owen Cote have been exceptionally supportive mentors and colleagues in this business. They keep me honest and push me to be a better, and smarter, scholar, though I often fall short. A special thanks to Barry Posen, who, as a leader and a role model, has done more to inspire me to want to be pre- cise in my language, rigorous in my thinking, and honest to the data than anyone—because he expects nothing less from himself, his colleagues, and students. Frank Gavin was part of our merry band for too short a time but left an indelible mark on me and our program, pushing me to try to be fear- less in challenging conventional wisdoms. Melissa Nobles, David Singer, and Andrea Campbell have provided invaluable support, and served as fantastic leaders, in the political science department. And I am especially indebted to Lynne Levine, Maria DiMauro, and Janine Sazinsky for helping me keep the trains running on time. Also, a special thanks to MIT itself, which managed the pandemic as well as can be imagined, including prioritizing reopening the campus daycare full time—with its incredible teachers and staff, without whom I would not have been able to complete this book. My MIT PhD students have been, and will forever remain, my pride and joy. Not only am I proud of each of their own scholarly and policy achieve- ments, but many have helped me immeasurably on this book as research assistants: Mark Bell, Nicholas Blanchette, Christopher Clary, Fiona Cun- ningham, Suzanne Freeman, Mayumi Fukushima, Jason Kwon, Sameer Lal- wani, Nicholas Miller, Aidan Milliff, Cullen Nutt, Reid Pauly, Rachel Tecott,