There is a broad sense in both Russia and the United States that deep nuclear reductions—a goal endorsed by both governments—would constitute a risky step into the unknown and could undermine international security. However, until now, the reasons behind these concerns—and whether they are justified—have not been properly explored. Based on a series of interviews with opinion formers in both Russia and the United States, this Adelphi maps out these concerns as they relate to the effectiveness of deterrence (including extended deterrence), the possible incentives to use nuclear weapons first in a crisis, the potential for rearmament and nuclear multipolarity. Contrary to popular belief, there is evidence against which these fears can be assessed. The practical experience of deterrence at low numbers that was acquired by the Soviet Union and the United States early in the Cold War, as well as by other nuclear-armed states, is highly relevant. Based on this experience and insights from deterrence theory, this Adelphi concludes that most of the challenges associated with low numbers are not really a consequence of arsenal size and, accordingly, that there are good reasons to believe that deep reductions would not undermine international security.
There is a broad sense in both Russia and the United States that deep nuclear reductions—a goal endorsed by both governments—would constitute a risky step into the unknown and could undermine international security. However, until now, the reasons behind these concerns—and whether they are justified—have not been properly explored. Based on a series of interviews with opinion formers in both Russia and the United States, this Adelphi maps out these concerns as they relate to the effectiveness of deterrence (including extended deterrence), the possible incentives to use nuclear weapons first in a crisis, the potential for rearmament and nuclear multipolarity. Contrary to popular belief, there is evidence against which these fears can be assessed. The practical experience of deterrence at low numbers that was acquired by the Soviet Union and the United States early in the Cold War, as well as by other nuclear-armed states, is highly relevant. Based on this experience and insights from deterrence theory, this Adelphi concludes that most of the challenges associated with low numbers are not really a consequence of arsenal size and, accordingly, that there are good reasons to believe that deep reductions would not undermine international security.
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