The Third Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons will be held in Geneva, Switzerland, in 1985 with a view to assuring that the purposes and provisions of the Treaty are being realized. The Treaty, commonly referred to as the non-proliferation Treaty, is the fundamental instrument to avert the danger of proliferation of nuclear weapons and is, perhaps, the most important multilateral arms regulation agreement of our time. It was negotiated in the 1960s in the Eighteen-Nation Committee on Disarmament in Geneva and in the United Nations General Assembly. The Treaty was opened for signature in London, Moscow and Washington on July 1, 1968. On that date, it was signed by the three Depositary Governments - the Soviet Union, the United Kingdom and the United States - and by 58 other States. As of December 31, 1983 the number of States parties to the Treaty had risen to 119.