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But other countries are developing more sophisticated missiles and against some of those threats, the U.S. is utterly undefended. The U.S. must take a new look at its strategic posture. By decreasing its nuclear forces and failing to build robust defenses, the U.S. is not leading the world to peace. It is putting itself in grave danger.

Rebeccah Heinrichs, a scholar on nuclear deterrence and missile defense, is a visiting fellow at the Heritage Foundation (