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The nuclear-weapons treaty President Obama has negotiated with the Russians may help him make America’s erstwhile Cold War adversary happy, but it won’t help protect us from the rogue nations that threaten the United States today.

If ratified, the New START treaty would force the U.S. to agree to strategic-nuclear-weapons parity with the direct descendant of a nation that threatened our country’s existence for decades. Who would have thought in the year 2010 the United States would be renewing its Cold War–era policy of...