Bulletin of the Atomic Scientists
June 16, 2017
By Ray Acheson
Since 1970, the Nuclear Non-Proliferation Treaty (NPT) has been the sole international agreement committing nuclear-armed states to disarmament. Every five years, the 189 states party meet in a review conference to assess how things are going. Before each review conference, they hold several preparatory meetings, the most recent of which took place in Vienna in May.
