For close to sixty years, the United States has maintained alliances with Japan and South Korea that have included a nuclear umbrella, guaranteeing their security as part of a strategy of extended deterrence. Yet questions about the credibility of deterrence commitments have always been an issue, especially when nuclear weapons are concerned. Would the United States truly be willing to use these weapons to defend an ally?

In this book, Terence Roehrig provides a detailed and comprehensive look at the nuclear umbrella in northeast Asia in the broader context of deterrence theory and U.S....

For close to sixty years, the United States has maintained alliances with Japan and South Korea that have included a nuclear umbrella, guaranteeing their security as part of a strategy of extended deterrence. Yet questions about the credibility of deterrence commitments have always been an issue, especially when nuclear weapons are concerned. Would the United States truly be willing to use these weapons to defend an ally?

In this book, Terence Roehrig provides a detailed and comprehensive look at the nuclear umbrella in northeast Asia in the broader context of deterrence theory and U.S....