Mutual Defense Agreement (1958)

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The Mutual Defense Agreement (1958) is a landmark Cold War-era treaty that deepened U.S.–UK strategic cooperation by enabling extensive collaboration on nuclear weapons and defense technology.

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Generate an image of the Mutual Defense Agreement (1958) (The Mutual Defense Agreement (1958) is a landmark Cold War-era treaty that deepened U.S.–UK strategic cooperation by enabling extensive collaboration on nuclear weapons and defense technology.)

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Statements (50)

Predicate Object
instanceOf Cold War treaty ⓘ
bilateral defense treaty ⓘ
international agreement ⓘ
aimsTo strengthen Western nuclear deterrence against the Soviet Union ⓘ
category Nuclear weapons policy of the United Kingdom ⓘ
Nuclear weapons policy of the United States ⓘ
United States–United Kingdom military relations ⓘ
compliesWith United States non-proliferation obligations as interpreted by the US government ⓘ
countryParty United Kingdom of Great Britain and Northern Ireland ⓘ
linked to: United Kingdom

United States of America ⓘ
enables cooperation on nuclear submarine propulsion technology ⓘ
cooperation on nuclear warhead safety and reliability ⓘ
joint work on nuclear weapons effects and testing data ⓘ
transfer of nuclear weapons-related design information from the US to the UK ⓘ
enteredIntoForceDate 1958-08-04 ⓘ
enteredIntoForceYear 1958 ⓘ
era Cold War ⓘ
field atomic energy ⓘ
defense technology ⓘ
nuclear weapons ⓘ
geopoliticalSignificance key instrument in NATO’s overall nuclear posture ⓘ
symbol of the special relationship between the United States and the United Kingdom ⓘ
influencedBy strategic competition with the Soviet Union ⓘ
language English ⓘ
legalBasis United States Atomic Energy Act of 1954 as amended ⓘ
officialName Agreement between the Government of the United States of America and the Government of the United Kingdom of Great Britain and Northern Ireland for Cooperation on the Uses of Atomic Energy for Mutual Defence Purposes ⓘ
purpose to deepen US–UK strategic cooperation on nuclear weapons and related technology ⓘ
to enable cooperation on the uses of atomic energy for mutual defence purposes ⓘ
to enhance joint nuclear deterrence capabilities of the US and UK ⓘ
to facilitate cooperation on nuclear propulsion for naval vessels ⓘ
to facilitate exchange of classified information on nuclear weapons design and manufacture ⓘ
relation complements the 1963 Polaris Sales Agreement ⓘ
forms the legal framework for much of the US–UK nuclear relationship ⓘ
supports the UK’s independent nuclear deterrent through US technical assistance ⓘ
renewal extended multiple times since 1958 ⓘ
periodically renewed by both governments ⓘ
renewalInterval typically 10 years ⓘ
restriction cooperation limited to mutual defence purposes ⓘ
does not authorize transfer of complete nuclear weapons ⓘ
shortName US–UK MDA ⓘ
US–UK Mutual Defence Agreement ⓘ
signingDate 1958-07-03 ⓘ
signingYear 1958 ⓘ
status in force ⓘ
subjectTo periodic review by the UK Parliament ⓘ
periodic review by the US Congress ⓘ
typeOfCooperation collaboration on nuclear materials handling and safety ⓘ
collaboration on nuclear weapons delivery systems-related technology ⓘ
exchange of classified nuclear information ⓘ
technical assistance on nuclear warhead design ⓘ

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