Non-Proliferation Treaty

The Treaty on the Non-Proliferation of Nuclear Weapons, or NPT, is an international agreement aimed at preventing the spread of nuclear weapons and promoting cooperation in peaceful nuclear energy uses. It was negotiated between 1965 and 1968, opened for signature in 1968, and entered into force in 1970. The treaty defines nuclear-weapon states as those that have built and tested a nuclear device before January 1, 1967, and currently has 191 state parties, excluding four UN member states, including India, Israel, and Pakistan, which possess or are believed to possess nuclear weapons. The NPT is reviewed every five years and has been extended indefinitely since 1995.learn more on wikipedia