Arms control expert Kelsey Davenport joins Ian Bremmer on GZERO World to talk about the world's long fascination with nuclear weapons and how close we still remain to all-out nuclear war. Today's nuclear threat is not about who has the most nukes, it's about who has the smartest ones. Davenport addresses the question: Do nuclear weapons keep us safe?

Watch this episode of GZERO World with Ian Bremmer: