The New START treaty has expired leaving the US and Russia without a bilateral limit on offensive strategic arms for the first time in decades. There is reportedly a handshake deal not to do anything drastic for six months while the two sides talk about the outlines of a future deal, but there seems to be little agreement about what such a deal might look like.  Aaron and Jeffrey discuss the end of New START, the prospects for and constraints on a looming arms race, and why even bother with arms control treaties at all.