The 2010 New Strategic Arms Reduction Treaty (New START) required that the United States and Russia reduce their strategic nuclear forces to levels not seen since the 1960s. The treaty expires on Thursday. After that, there will be no agreement constraining the US and Russian nuclear weapons levels—for the first time in nearly three decades.

Neither Washington nor Moscow (or Beijing for that matter) shows real interest in pursuing nuclear arms control now, which leaves the prospects of an ensuing nuclear arms race fairly high.

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