A United Nations-backed panel has publicly released a draft treaty banning the possession and use of all nuclear weapons. The draft treaty is the culmination of a sustained campaign, supported by more than 130 non-nuclear states frustrated with the sclerotic pace of disarmament, to prohibit nuclear weapons and persuade nuclear-armed states to disarm. Nine countries are known or believed to possess nuclear weapons: the US, UK, Russia, China, France, India, Pakistan, North Korea and Israel. None has supported the draft plan. The draft treaty obliges state parties to “never under any circumstances … develop, produce, manufacture, otherwise acquire, possess or...