American allies in Europe and Asia perceive growing threats that challenge the credibility of U.S. extended deterrence commitments. In an era of fiscal limitations, however, Washington will have to make some important choices about how to develop and deploy capabilities that will best reassure allies. What commitments should the United States be prepared to offer? Should there be limitations on these commitments? What practical steps should be taken to help address perceived threats? How central should U.S. nuclear weapons, as opposed to conventional or non-military capabilities, be in extended deterrence planning? 

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