The USA and Soviet Union, in the aftermath of the Cuban crisis, accelerate steps for nuclear arms control. The Partial Nuclear Test Ban Treaty is negotiated, co-sponsored by the USA, Soviet Union, and UK. It bans nuclear tests in the atmosphere, underwater, and in outer space. In a speech in March 1963, US President Kennedy warns of a nuclear arms race: “Personally I am haunted by the feeling that by 1970, unless we are successful, there may be ten nuclear powers instead of four, and by 1975, fifteen or twenty.... I see the possibility in the 1970s of the President of the United States having to face a world in which fifteen or twenty or twenty-five nations may have these weapons. I regard this as the greatest possible danger and hazard.“