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

E43855

bilateral treaty defence agreement nuclear cooperation agreement

The Mutual Defense Agreement (1958) is a landmark Cold War-era treaty that established extensive nuclear weapons and atomic energy cooperation between the United States and the United Kingdom for mutual defense.

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Observed surface forms (5)

Surface form	Occurrences
1958 US–UK Mutual Defence Agreement	2
US–UK Mutual Defence Agreement	2
1948 US–UK Modus Vivendi on atomic energy cooperation	1
Agreement between the Government of 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	0
US–UK nuclear weapons collaboration	1

Statements (48)

Predicate	Object
instanceOf	bilateral treaty ⓘ defence agreement ⓘ nuclear cooperation agreement ⓘ
alsoKnownAs	Mutual Defense Agreement (1958) ⓘ surface form: 1958 Mutual Defense Agreement 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 ⓘ surface form: 1958 US–UK Mutual Defence Agreement Mutual Defense Agreement (1958) ⓘ surface form: US–UK Mutual Defense Agreement
complements	North Atlantic Treaty ⓘ surface form: North Atlantic Treaty of 1949
context	Cold War ⓘ
countrySignatory	United Kingdom ⓘ surface form: United Kingdom of Great Britain and Northern Ireland United States of America ⓘ
dateSigned	1958-07-03 ⓘ
enables	cooperation on nuclear submarine propulsion ⓘ transfer of fissile material from the United States to the United Kingdom ⓘ transfer of nuclear warhead design information ⓘ
enteredIntoForce	1958-08-04 ⓘ
field	military nuclear technology ⓘ nuclear deterrence ⓘ
governs	transfer of special nuclear material for defence purposes between the United States and the United Kingdom ⓘ
hasBeenExtended	true ⓘ
historicalSignificance	cornerstone of US–UK nuclear weapons collaboration ⓘ first agreement allowing the United States to share detailed nuclear weapons design information with another state ⓘ
inForce	true ⓘ
initialDuration	10 years ⓘ
language	English ⓘ
legalBasis	Atomic Energy Act of 1954 ⓘ surface form: United States Atomic Energy Act of 1954
notableAmendment	1963 amendment expanding scope of cooperation ⓘ 1974 amendment following UK accession to the European Communities ⓘ 2004 renewal and amendment ⓘ 2014 renewal and amendment ⓘ
placeSigned	Washington, D.C. ⓘ
purpose	cooperation on the uses of atomic energy for mutual defence purposes ⓘ exchange of classified information on nuclear weapons design ⓘ exchange of special nuclear material for defence ⓘ nuclear weapons cooperation ⓘ
relatedTo	NATO ⓘ surface form: North Atlantic Treaty Organization Trident nuclear missile system ⓘ surface form: UK Trident nuclear weapons programme US–UK Polaris Sales Agreement ⓘ US–UK nuclear weapons cooperation ⓘ Anglo-American relations ⓘ surface form: US–UK special relationship
renewalInterval	10 years ⓘ
shortName	Mutual Defense Agreement (1958) ⓘ 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 self-linksurface differs ⓘ surface form: US–UK Mutual Defence Agreement
subjectMatter	atomic energy ⓘ exchange of nuclear materials ⓘ exchange of nuclear technology ⓘ exchange of nuclear weapons-related information ⓘ nuclear propulsion for naval vessels ⓘ nuclear weapons ⓘ

Referenced by (8)

Full triples — surface form annotated when it differs from this entity's canonical label.

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 → alsoKnownAs → 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 ⓘ

this entity surface form: 1958 US–UK Mutual Defence Agreement

Nuclear weapons policy of the United Kingdom → cooperationFramework → 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 ⓘ

this entity surface form: 1958 US–UK Mutual Defence Agreement

Quebec Agreement → established → 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 ⓘ

this entity surface form: US–UK nuclear weapons collaboration

US–UK MDA → fullName → 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 ⓘ

Quebec Agreement → influenced → 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 ⓘ

this entity surface form: US–UK Mutual Defence Agreement

Mutual Defense Agreement (1958) → 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 ⓘ

US–UK MDA → predecessor → 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 ⓘ

this entity surface form: 1948 US–UK Modus Vivendi on atomic energy cooperation

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 → shortName → 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 self-linksurface differs ⓘ

this entity surface form: US–UK Mutual Defence Agreement