Comprehensive Test Ban Treaty (CTBT)

The Obama Administration committed itself to submitting the CTBT to the Senate for ratification, but support there is uncertain (it requires the support of 67 Senators). This is crucial to several other key states' ratification, and necessary for the Treaty to come into force.

Treaty text (has not entered into force), Comprehensive Test Ban Treaty Organization

Non-Proliferation Treaty

The NPT is the corner-stone of the international nuclear disarmament and non-proliferation regime. The NPT Review Conference in May 2010 was a key moment for the global debate around nuclear disarmament and non-proliferation, and the agreement at its conclusion sets the framework for international negotiations over the period 2010 to 2015.

New Strategic Arms Reduction Treaty (START)

Signed by Presidents Obama and Medvedev on April 8, 2010, New START replaces the 1991 START treaty limiting U.S. and Russian strategic nuclear weapon systems. The agreement introduces lower ceilings for the numbers of deployed warheads and delivery systems, and continues many of the necessary verification procedures. New START entered into force on February 5, 2011.