Per U.S. officials with knowledge of the call, after Putin brought up New START and possibly extending it, the president paused the call so he could ask his aides about what it was before proceeding to slam it, lumping it in with other “bad deals” that President Barack Obama had negotiated. The treaty, which was signed in 2010, gives both countries until February 2018 to reduce the number of strategic nuclear warheads deployed down to 1,550.