معاهدة الحد من انتشار الأسلحة النووية
Eight sovereign states have publicly announced successful detonation of nuclear weapons. Five are considered to be nuclear-weapon states (NWS) under the terms of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). In order of acquisition of nuclear weapons these are the United States, the Soviet Union (now Russia), the United Kingdom, France, and China.