President Trump has made it clear he doesn’t think diplomacy on its own will stop Iran from developing nuclear weapons.So what does history tell us about what actually works? We’re looking back at one of the greatest nuclear risk reduction efforts ever — when the US and Russia joined forces to contain the weapons fallout from the Soviet collapse and convince countries like Ukraine to give up the nuclear arsenal they inherited.

An effort that was led by diplomacy, pragmatism and scientific expertise during a brief period of goodwill between the two countries.

GUESTSGraham Allison - Douglas Dillon Professor of Government at the Harvard Kennedy SchoolMariana Budjeryin - Senior Researcher at the Centre for Nuclear Security at MIT and author of Inheriting the Bomb: The Collapse of the USSR and the Nuclear Disarmament of UkraineDavid E Hoffman - author of The Dead Hand: The Untold Story of the Cold War Arms

GUESTSGraham Allison - Douglas Dillon Professor of Government at the Harvard Kennedy SchoolMariana Budjeryin - Senior Researcher at the Centre for Nuclear Security at MIT and author of Inheriting the Bomb: The Collapse of the USSR and the Nuclear Disarmament of UkraineDavid E Hoffman - author of The Dead Hand: The Untold Story of the Cold War Arms