There tends to be this comfortable assumption that nuclear weapons won't be used, but I don't think that's warranted, and I think we should seize the opportunity of this time of stability and cooperation and move towards global elimination of nuclear weapons as indeed people like Henry Kissinger, and William Perry, former Secretary of Defense under Clinton, and Sam Nunn, former Senator, and George Schultz, former Undersecretary of State for Ronald Reagan. All of them recently called for achievement of a nuclear weapon-free world.