Forty years ago today, in the midst of a Cold War, the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) entered into force, becoming the cornerstone of the world’s efforts to prevent the spread of nuclear weapons.  Today, the threat of global nuclear war has passed, but the danger of nuclear proliferation endures, making the basic bargain of the NPT more important than ever: nations with nuclear weapons will move toward disarmament, nations without nuclear weapons will forsake them, and all nations have an “inalienable right” to peaceful nuclear energy.

Each of these three pillars – disarmament, nonproliferation and peaceful uses – are central to the vision that I outlined in Prague of stopping the spread of nuclear weapons and seeking a world without them.