The Mutual Defence Agreement allows the US and UK to exchange nuclear materials, technology and information in order to improve their atomic weapon design, development and fabrication capabilities. The most important part of the MDA is due to expire at the end of 2014 and therefore an amendment treaty, which will extend this deadline to 2024, must be ratified by both States and brought into force by the end of this year.
UK-USA Mutual Defence Agreement (399 KB , PDF)
The Agreement between the UK and the USA for Cooperation in the Uses of Atomic Energy for Mutual Defence Purposes 1958, also known as the Mutual Defence Agreement (MDA), allows the United States and the UK to exchange nuclear materials, technology and information. It was the result of an amendment to post-war US non-proliferation law, which exempted allies that had made substantial progress in developing nuclear weapons from the general ban on exchanges that might lead to nuclear proliferation.
The most important part of the MDA is time limited and is due to expire at the end of 2014. An amendment to the treaty, which will extend this deadline to 2024, must be ratified by both States and brought into force by the end of this year.
The Government published its amendments to the MDA as Command Paper 8947 on 16 October 2014. Under the Constitutional Reform and Governance Act 2010 both Houses have the opportunity to oppose ratification should they so wish, but only the House of Commons has the potential to block the treaty indefinitely. If neither House passes a resolution opposing ratification within 21 sitting days, the Government can go ahead and ratify the treaty.
Critics argue that the MDA, as amended, contravenes the parties’ obligations under the Treaty on the Non-Proliferation of Nuclear Weapons 1968 (NPT).
UK-USA Mutual Defence Agreement (399 KB , PDF)
In a vote in July 2016 the House of Commons approved the decision to maintain the UK’s nuclear deterrent beyond the early 2030s. After almost a decade of work on the project, that vote subsequently enabled the programme to move forward into its manufacturing phase, which will see the construction of four new Dreadnought class ballistic missile submarines entering service in the 2030s.
A briefing paper on the legal issues surrounding a Scottish independence referendum
In response to Russian military action in Ukraine, Western allies and other partners across the globe have imposed an unprecedented package of coordinated sanctions against Russia. This briefing paper should be taken as correct at the time of writing.
