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U.S. Department of State

Diplomacy in Action

Nuclear Nonproliferation Treaty


The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) was opened for signature in 1968 and entered into force in 1970. Its membership includes 189 States Parties, making it the largest of any arms control treaty in the world. It comprises legally binding nonproliferation commitments and is the basis for international cooperation to stem the spread of nuclear weapons. The Treaty is underpinned by three “pillars”—nuclear nonproliferation, disarmament, and the peaceful use of nuclear energy—and is regarded as the legal and political cornerstone of the nuclear nonproliferation regime. In Prague on April 5, 2009, President Obama stated that the basic bargain at the core of the Treaty is sound: “Countries with nuclear weapons will move towards disarmament; countries without nuclear weapons will not acquire them; and all countries can access peaceful nuclear energy.” The President also called on NPT parties to take steps to strengthen this vital nonproliferation instrument.

The NPT Review Process

The Treaty allows for the Parties to gather every five years to review its operation. At the 1995 Review and Extension Conference, the Parties extended the Treaty indefinitely and formalized the practice of convening a Review Conference (RevCon) every five years, as well as holding Preparatory Committee (PrepCom) meetings in each of the three years preceding a RevCon. The 2014 PrepCom for the 2015 NPT RevCon will take place at the United Nations headquarters in New York from April 28-May 9 under the Non-Aligned Movement Chairmanship of Peruvian Ambassador Enrique Román-Morey. This will be the third meeting of the review cycle that will culminate in the 2015 NPT Review Conference.


Contact Us: The Special Representative of the President for Nuclear Nonproliferation and the Office of Multilateral Nuclear and Security Affairs lead U.S. efforts in support of the NPT. Questions and media inquiries should be directed to Sandra Postell at


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