China, France, Russia, United Kingdom, United States: All have declared their nuclear status and are recognized under the Nuclear Non-Proliferation Treaty (NPT) as nuclear-weapon states because each detonated a nuclear test prior to Jan. 1, 1967. Estimated Nuclear Stockpiles: Strategic Tactical U.S. 8.500 7,000 Russia 7,200 6,000 ³ 13,000 United Kingdom 100 100 France 482 0 China 284 150 Maps  ·  Timeline  ·  Interviews  ·  FAQS  ·  Links  ·  Readings Reactions  ·  Tapes and Transcripts  ·  Explore FRONTLINE web site copyright WGBH educational foundation