The United Nations International Day for the Total Elimination of Nuclear Weapons is September 26.
There are far fewer nuclear weapons now than at the height of the Cold War and the major nuclear powers have adhered to the principle of disarmament.
But there are fears of a renewed nuclear arms race between the United States, Russia and China.
Reality Check’s Jack Goodman takes a look at the facts and figures behind the world’s nuclear arsenals.
Motion graphics by Jacqueline Galvin.