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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.

Evidence Submitted by Tim Hare

 December 2012

Tim Hare submitted evidence to the Trident Commission, entitled 'The US nuclear guarantee, and possible future threats', answering the following scenarios and questions:

1. Possible future credible threats (capability and intention) to UK and allies that would not sufficiently involve the US, and would not be deterrable by other means

2. Probability that a US nuclear guarantee can be relied upon into the foreseeable future

Evidence submitted by the Nuclear Information Service – Aug 2012

August 2012

The Nuclear Information Service (NIS) submitted a redacted copy of the Defence Nuclear Executive Board's risk register for the defence nuclear programme, provided by the Ministry of Defence and an unredacted verision of the risk register by NIS detailing views as to the key risks which the Trident replacement programme will face over the years and decades ahead.