This week, Bronwen Maddox discusses whether we are seeing a resurgence of the threat posed by nuclear weapons, given recent events in the Middle East and rhetoric from world leaders.

On the panel is Robert E Kelly, Professor of Political Science at Pusan National University, Dr Hanna Notte, Director of the Eurasia Nonproliferation Program at the James Martin Center for Nonproliferation Studies and Dr Patricia Lewis, Director of the International Security Programme at Chatham House.