 US–UK Mutual Defence Agreement

The US–UK Mutual Defence Agreement, formally known as the Mutual Defense Agreement (MDA), is a key treaty between the United States and the United Kingdom that was first signed in 1958. The agreement primarily governs cooperation in the field of defense, particularly the sharing and exchange of nuclear weapons technology and information. It was established during the Cold War as a way for the two countries to collaborate on nuclear deterrence and to enhance their mutual defense capabilities.