Once again, the world faces a nuclear crisis in North Korea – this time more than ever, with unpredictable leadership on both sides. With missiles armed and ready, the world may perish in a free-for-all exchange, despite all the diplomacy. Calls for a total ban on nuclear weapons are also ringing louder. But can humanity really give them up? We ask Lassina Zerbo, executive secretary of the Comprehensive Nuclear Test Ban Treaty organization and participant of the Valdai Discussion Club.