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Wikipedia / Defense pact

A defense pact (Commonwealth spelling: defence pact) is a type of treaty or military alliance in which the signatories promise to support each other militarily and to defend each other. Generally, the signatories point out the threats and concretely prepare to respond to it together.

    Year in force

    Name

    Member states

    Treaty name

    Also known as

    Present members

    Former / suspended members

    1947

    Inter-American Treaty of Reciprocal Assistance

    Rio TreatyTIAR

    • (1982–present)

    • (1967–present)

    • (1948–2019, 2020–present)

    • (1948–2015, 2019–present)

  • (1948–1962; suspended)

  • (1948–2014)

  • (1948–2016)

  • (1948–2004)

  • (1948–2014)

  • 1949

    North Atlantic Treaty

    Washington TreatyNATO

    • (2009)

    • (2004)

    • (2009)

    • (1999)

    • (2004)

    • (2023)

    • (1955; as West Germany; reunified territory covered from 1990)

    • (1952)

    • (1999)

    • (2004)

    • (2004)

    • (2017)

    • (2020)

    • (1999)

    • (2004)

    • (2004)

    • (2004)

    • (1982)

    • (2024)

    • (1952)

    1951

    Mutual Defense Treaty (United States–Philippines)

    1951

    ANZUS

    Australia, New Zealand, United States Security Treaty

    1953

    Mutual Defense Treaty (United States–South Korea)

    1960

    Treaty of Mutual Cooperation and Security between the United States and Japan

    1961

    Sino-North Korean Mutual Aid and Cooperation Friendship Treaty

    Sino-North Korean Treaty of Friendship, Co-operation and Mutual Assistance

    1962

    Thanat–Rusk communiqué

    1992

    Collective Security Treaty Organization

    CSTOCollective Security Treaty

    • (1994–1999)

    • (1994–1999)

    • (1994–1999, 2006–2012)

    2008

    South African Development Community (SADC) Mutual Defence Pact

    2009

    Treaty of Lisbon (Common Security and Defence Policy provisions)

    CSDPEuropean Union mutual defence clause (Article 42.7 TEU)

    • (left the EU in 2020)

    2010

    Agreement on Strategic Partnership and Mutual Support

    2021

    Franco-Greek defence agreement

    2021

    AUKUS

    2023

    Alliance of Sahel States

    AES

    2024

    North Korean–Russian Treaty on Comprehensive Strategic Partnership

    2025

    Strategic Mutual Defence Agreement

    SMDA

    2025

    Pukpuk Treaty

    Papua New Guinea–Australia Mutual Defence Treaty

    2026

    Ocean of Peace Alliance

    Veitacini Treaty

    2026

    Mecca Joint Defence Agreement

    Makkah Joint Defence Agreement

    Current mutual defence treaties and alliances

    Historical treaties

    Year

    Treaty name

    Member States

    1778–1798

    Treaty of Alliance

    1873–1887

    League of the Three Emperors

    1921–1938

    Little Entente

    1934–1941

    Balkan Pact

    1950–1979

    Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance

    1954–1977

    Southeast Asia Treaty Organization

    1955–1979

    Central Treaty Organization

    1955–1979

    Sino-American Mutual Defense Treaty

    1955–1991

    Warsaw Pact

    See also

    References