The only ones that stood out, in that sense, were Russia and North Korea. The U.S. already had a well-defined security arrangement—an acknowledged state of mutual deterrence—with Russia. That left North Korea, and the one distinctive thing about North Korea was that, several years earlier, it had withdrawn from the Non-Proliferation Treaty. Obama suggested this for a policy: the United States will not use, or threaten to use, nuclear weapons against countries that had no nuclear weapons and that were abiding by the NPT. Neither he nor the others in the room knew or remembered, but thirty years
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