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

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.

All labels observed (6)

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf bilateral treaty
defence agreement
nuclear cooperation agreement
alsoKnownAs 1958 Mutual Defense Agreement
1958 US–UK Mutual Defence Agreement
US–UK Mutual Defense Agreement
complements North Atlantic Treaty of 1949
context Cold War
countrySignatory United Kingdom of Great Britain and Northern Ireland
linked to: United Kingdom

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 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 North Atlantic Treaty Organization
linked to: NATO

UK Trident nuclear weapons programme
US–UK Polaris Sales Agreement
US–UK nuclear weapons cooperation
US–UK special relationship
renewalInterval 10 years
shortName Mutual Defense Agreement (1958)
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

How these facts were elicited

Referenced by (9)

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

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 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
US–UK MDA predecessor 1948 US–UK Modus Vivendi on atomic energy cooperation
linked to: 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
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 US–UK Mutual Defence Agreement
linked to: 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
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 1958 US–UK Mutual Defence Agreement
linked to: 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
Nuclear weapons policy of the United Kingdom cooperationFramework 1958 US–UK Mutual Defence Agreement
linked to: 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 established US–UK nuclear weapons collaboration
linked to: 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 US–UK Mutual Defence Agreement
linked to: 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
Dreadnought programme technologySharingContext UK–US nuclear cooperation
linked to: 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