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.^[1] Generally, the signatories point out the threats and concretely prepare to respond to it together.^[2]

Current treaties

Year	Name		Member states
	Treaty name	Also known as	Present members	Former/suspended members
1373	Anglo-Portuguese Treaty of 1373	Anglo-Portuguese Alliance	Portugal  United Kingdom
1947	Inter-American Treaty of Reciprocal Assistance	Rio Treaty TIAR	Argentina  Brazil  Chile  Colombia  Costa Rica  Dominican Republic  El Salvador  Guatemala  Haiti  Honduras  Panama  Paraguay  Peru  United States  Uruguay (1948–2019, 2020–present)  Venezuela (1948–2015, 2019–present)  Trinidad & Tobago (1967–present)  The Bahamas (1982–present)	Cuba (1948–1962) (suspended)  Bolivia (1948–2014)  Ecuador (1948–2016)  Mexico (1948–2004)  Nicaragua (1948–2014)
1949	North Atlantic Treaty	Washington Treaty NATO OTAN	Belgium  Canada  Denmark  France  Iceland  Italy  Luxembourg  Netherlands  Norway  Portugal  United Kingdom  United States  Greece[N 1] (joined 1952)  Turkey (joined 1952)  Germany (joined 1955)[N 2]  Spain (joined 1982)  Czechia (joined 1999)  Hungary (joined 1999)  Poland (joined 1999)  Bulgaria (joined 2004)  Estonia (joined 2004)  Latvia (joined 2004)  Lithuania (joined 2004)  Romania (joined 2004)  Slovakia (joined 2004)  Slovenia (joined 2004)  Albania (joined 2009)  Croatia (joined 2009)  Montenegro (joined 2017)  North Macedonia (joined 2020)  Finland (joined 2023)  Sweden (joined 2024)	British Cyprus (1949-1960)  French Algeria (1949-1962)[N 3]  Crown Colony of Malta (1949-1964)
1951	Mutual Defense Treaty Between the United States and the Republic of the Philippines		Philippines  United States
1951	ANZUS		Australia  New Zealand  United States
1953	Mutual Defense Treaty between the United States and the Republic of Korea		South Korea  United States
1960	Treaty of Mutual Cooperation and Security between the United States and Japan		Japan  United States
1961	Sino-North Korean Treaty of Friendship, Co-operation, and Mutual Assistance		China  North Korea
1992	Collective Security Treaty	CSTO	Armenia  Belarus  Kazakhstan  Kyrgyzstan  Russia  Tajikistan	Azerbaijan (1994–1999)  Georgia (1994–1999)  Uzbekistan (1994–1999, 2006–2012)
2019	Treaty on Franco-German Cooperation and Integration	Aachen Treaty	France  Germany
2021	Franco-Greek defence agreement[3]		France  Greece
2023	Alliance of Sahel States		Burkina Faso  Mali  Niger
2024	North Korean–Russian Treaty on Comprehensive Strategic Partnership		North Korea  Russia

1. Joined as Kingdom of Greece.
2. Joined as West Germany. After reunification in 1990, the former East German territory became covered by NATO protection.
3. Joined as part of French Fourth Republic. After Algerian independence in 1962, the former French Algerian territory's NATO protection ceased as the Article VI clause was no longer applicable.

Historical treaties

Year	Treaty name	Member States
1778–1798	Treaty of Alliance	Kingdom of France ( French First Republic from 1792) United States
1873–1887	League of the Three Emperors	German Empire Austria-Hungary Russian Empire
1950–1979	Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance	China Soviet Union
1954–1977	Southeast Asia Treaty Organization	Australia France New Zealand Pakistan (withdrew in 1973) Philippines Thailand United Kingdom United States
1955–1979	Middle East Treaty Organization	Iran Iraq (withdrew in 1959) Pakistan Turkey United Kingdom
1955–1980	Sino-American Mutual Defense Treaty	Taiwan United States
1955–1991	Warsaw Pact	Albania (withdrew in 1968) Bulgaria Czechoslovakia East Germany Hungary Poland Romania Soviet Union

See also

• Military alliance
• List of military alliances