A leading international security strategist offers a compelling new way to "think about the unthinkable." The cold war ended more than two decades ago, and with its end came a reduction in the threat of nuclear weapons—a luxury that we can no longer indulge. It's not just the threat of Iran getting the bomb or North Korea doing something rash; the whole complexion of global power politics is changing because of the reemergence of nuclear weapons as a vital element of statecraft and power politics. In short, we have entered the second nuclear age. In this provocative and agenda-setting book, Paul Bracken of Yale University argues that we need to pay renewed attention to nuclear weapons and how their presence will transform the way crises develop and escalate. He draws on his years of experience analyzing defense strategy to make the case that the United States needs to start thinking seriously about these issues once again, especially as new countries acquire nuclear capabilities. He walks us through war-game scenarios that are all too realistic, to show how nuclear weapons are changing the calculus of power politics, and he offers an incisive tour of the Middle East, South Asia, and East Asia to underscore how the United States must not allow itself to be unprepared for managing such crises. Frank in its tone and farsighted in its analysis, The Second Nuclear Age is the essential guide to the new rules of international politics.

A “second nuclear age” has begun in the post-Cold War world. Created by the expansion of nuclear arsenals and new proliferation in Asia, it has changed the familiar nuclear geometry of the Cold War. Increasing potency of nuclear arsenals in China, India, and Pakistan, the nuclear breakout in North Korea, and the potential for more states to cross the nuclear-weapons threshold from Iran to Japan suggest that the second nuclear age of many competing nuclear powers has the potential to be even less stable than the first. Strategy in the Second Nuclear Age assembles a group of distinguished scholars to grapple with the matter of how the United States, its allies, and its friends must size up the strategies, doctrines, and force structures currently taking shape if they are to design responses that reinforce deterrence amid vastly more complex strategic circumstances. By focusing sharply on strategy—that is, on how states use doomsday weaponry for political gain—the book distinguishes itself from familiar net assessments emphasizing quantifiable factors like hardware, technical characteristics, and manpower. While the emphasis varies from chapter to chapter, contributors pay special heed to the logistical, technological, and social dimensions of strategy alongside the specifics of force structure and operations. They never lose sight of the human factor—the pivotal factor in diplomacy, strategy, and war.

Keith Payne begins by asking, "Did we really learn how to deter predictably and reliably during the Cold War?" He answers cautiously in the negative, pointing out that we know only that our policies toward the Soviet Union did not fail. What we can be more certain of, in Payne's view, is that such policies will almost assuredly fail in the Second Nuclear Age—a period in which direct nuclear threat between superpowers has been replaced by threats posed by regional "rogue" powers newly armed with chemical, biological, or nuclear weapons. The fundamental problem with deterrence theory is that is posits a rational—hence predictable—opponent. History frequently demonstrates the opposite. Payne argues that as the one remaining superpower, the United States needs to be more flexible in its approach to regional powers.

The world has entered a second nuclear age shaped by rising nuclear states and military technologies. Gregory Koblentz argues that the United States should work with the other nuclear-armed states to manage threats to nuclear stability in the near term and establish processes for multilateral arms control efforts over the longer term.

The author takes issue with the complacent belief that a happy mixture of deterrence, arms control and luck will enable humanity to cope adequately with weapons of mass destruction, arguing that the risks are ever more serious.

The world is in a second nuclear age in which regional powers play an increasingly prominent role. These states have small nuclear arsenals, often face multiple active conflicts, and sometimes have weak institutions. How do these nuclear states—and potential future ones—manage their nuclear forces and influence international conflict? Examining the reasoning and deterrence consequences of regional power nuclear strategies, this book demonstrates that these strategies matter greatly to international stability and it provides new insights into conflict dynamics across important areas of the world such as the Middle East, East Asia, and South Asia. Vipin Narang identifies the diversity of regional power nuclear strategies and describes in detail the posture each regional power has adopted over time. Developing a theory for the sources of regional power nuclear strategies, he offers the first systematic explanation of why states choose the postures they do and under what conditions they might shift strategies. Narang then analyzes the effects of these choices on a state's ability to deter conflict. Using both quantitative and qualitative analysis, he shows that, contrary to a bedrock article of faith in the canon of nuclear deterrence, the acquisition of nuclear weapons does not produce a uniform deterrent effect against opponents. Rather, some postures deter conflict more successfully than others. Nuclear Strategy in the Modern Era considers the range of nuclear choices made by regional powers and the critical challenges they pose to modern international security.

The 2013-14 Strategic Asia volume examines the role of nuclear weapons in the grand strategies of key Asian states and assesses the impact of these capabilities—both established and latent—on regional and international stability. In each chapter, a leading expert explores the historical, strategic, and political factors that drive a country's calculations vis-a-vis nuclear weapons and draws implications for American interests.