The New START treaty served as a barrier against a renewed nuclear arms race between the US and Russia, who together possess almost 90% of the world’s atomic warheads. The accord was the only remaining arms control agreement between the two countries and expired on February 5. US President Donald Trump says he wants to negotiate a new treaty, but in the meantime, controls on these deadly weapons remain in limbo. Our global defense editor Gerry Doyle joins Stephen Carroll to discuss.