How big is the threat of nuclear war?

Britain's national security adviser has warned that the threat of nuclear war is greater than ever. He blames this on the breakdown of communication between the West, Russia and China. So, what's needed to restore global security? Join host Imran Khan. Guests: Sahil Shah - Nuclear non-proliferation and disarmament analyst. Fabrice Pothier - CEO of the consultancy Rasmussen Global. Alexander Titov - Lecturer in Modern European History at Queen’s University Belfast.