The Treaty on the Prevention of Nuclear Weapons Proliferation was signed on July 1, 1968 (June 6, 1968) after the United States, the Soviet Union and the United Kingdom signed the Treaty on the Partial Prohibition of Nuclear Weapons Tests, and the United States and the Soviet Union continued to trade on the nuclear issue. On July 1, 1968, the Soviet Union, the United States and the United Kingdom signed the Treaty on the Prevention of Nuclear Weapons Proliferation in Moscow, Washington and London. The Treaty entered into force on March 5, 1970. The Treaty stipulates that nuclear states must not control nuclear weapons or other nuclear explosives, directly or indirectly give it to any country, and will never assist, encourage or induce any non-nuclear weapons country to manufac