On May 19, 2000 (April 16, 2000 lunar calendar), the 2000 Review Conference of the United Nations Treaty on the Non-Proliferation of Nuclear Weapons ended in New York. On May 19, 2000, the 2000 Review Conference of the United Nations Treaty on the Non-Proliferation of Nuclear Weapons ended in New York. The main topics of the conference were: the universality of the Treaty on the Non-Proliferation of Nuclear Weapons; nuclear non-proliferation and disarmament; and nuclear-free zones. During the meeting, five countries, China, the United States, Russia, the United Kingdom, and France, reached an agreement to "unequivocally commit" to the total elimination of nuclear weapons.