This article originally appeared on the website Left Foot Forward. Today, US and Russian nuclear stockpiles are down from their Cold War peaks, but the global nuclear threat remains far too high. The US and Russia are estimated to have 4,018 and 4,500 warheads stockpiled and assigned for military use. Under the 2010 New Strategic Arms Reduction Treaty (START), each is limited to 1,550 deployed strategic nuclear weapons on as many as 700 nuclear delivery vehicles until 2021. If these weapons were used even in a ‘limited’ way, the result would be catastrophic. Even before the arrival of Donald...