Years
|
Name
|
Members
|
1902–1923
|
Anglo-Japanese Alliance
|
Japan
United Kingdom
|
1904
|
Entente Cordiale
[note 3]
|
France
United Kingdom
|
1904
|
Treaty of Sofia
|
Principality of Bulgaria
Kingdom of Serbia
|
1907–1917
|
Triple Entente
|
France
Russian Empire
United Kingdom
|
1912–1913
|
Balkan League
|
Kingdom of Bulgaria
Greece
Kingdom of Montenegro
Kingdom of Serbia
|
1913–1914
|
Greek–Serbian Alliance
|
Greece
Serbia
|
1914–1918
|
Central Powers
|
German Empire
Austria-Hungary
Ottoman Empire
|
1914–1918
|
Ottoman–Bulgarian alliance
|
Bulgaria
Ottoman Empire
|
1915–1918
|
Bulgaria–Germany treaty (1915)
|
Bulgaria
German Empire
|
1915–1918
|
German–Ottoman alliance
|
German Empire
Ottoman Empire
|
1916–1918
|
Treaty of Bucharest (1916)
|
France
Italy
Romania
Russian Empire
United Kingdom
|
1920–1921
|
Polish-Ukrainian Agreement
|
Poland
Ukraine
|
1920–1938
|
Little Entente
|
Czechoslovakia
Romania
Yugoslavia
|
1920–1940
|
Franco-Polish Alliance (1921)
|
France
Poland
|
1920–1921
|
Georgian–Polish alliance
|
Georgia
Poland
|
1921–1939
|
Polish–Romanian alliance
|
Poland
Romania
|
1922–1930
|
Anglo-Iraqi Treaty of 1922
|
Iraq
United Kingdom
|
1924–1938
|
Treaty of Alliance and Friendship between France and Czechoslovakia
|
Czechoslovakia
France
|
1930–1939/40
|
Finnish–Estonian defence cooperation
|
Estonia
Finland
|
1930–1947
|
Anglo-Iraqi Treaty of 1930
|
Iraq
United Kingdom
|
1934–1938
|
Balkan Pact
|
Greece
Romania
Turkey
Yugoslavia
|
1934–1938
|
Rome Protocols
|
Austria
Hungary
Italy
|
1934–1935
|
Stresa Front
|
France
Italy
United Kingdom
|
1935–1938
|
Czechoslovak–Soviet Treaty of Mutual Assistance
|
Czechoslovakia
Soviet Union
|
1935–1939
|
Franco-Soviet Treaty of Mutual Assistance
|
France
Soviet Union
|
1936–1956
|
Anglo-Egyptian Treaty of 1936
|
Egypt
United Kingdom
|
1939–1944
|
Anglo-Polish alliance
|
Poland
United Kingdom
|
1939–1945
|
Iberian Pact
|
Portugal
Spain
|
1939–1940
|
Soviet–Estonian Mutual Assistance Treaty
|
Estonia
Soviet Union
|
1939–1940
|
Soviet–Latvian Mutual Assistance Treaty
|
Latvia
Soviet Union
|
1939–1940
|
Soviet–Lithuanian Mutual Assistance Treaty
|
Lithuania
Soviet Union
|
1939–1949
[note 4]
|
Pact of Steel
|
Germany
Italy
|
1940
|
Ogdensburg Agreement
|
Canada
United States
|
1940–1945
|
Tripartite Pact
|
Bulgaria
Croatia
Germany
Hungary
Italy
Japan
Romania
Slovakia
Yugoslavia
[note 5]
|
1941–1945
|
Anglo-Soviet Agreement
|
Soviet Union
United Kingdom
|
1942–1945
|
Anglo-Soviet Treaty of 1942
|
Soviet Union
United Kingdom
|
1942–1945
|
Declaration by United Nations
|
|
1942–1945
|
Croatian–Romanian–Slovak friendship proclamation
|
Croatia
Romania
Slovakia
|
1943
|
Five Eyes (FVEY)
|
Australia
Canada
New Zealand
United Kingdom
United States
|
1946–1948
|
Treaty of London (1946)
[1]
|
Jordan
United Kingdom
|
1947–1957
|
UK–Ceylon Defence Pact
[2]
[3]
|
Ceylon
United Kingdom
|
1947–1997
|
Treaty of Dunkirk
|
France
United Kingdom
|
1947
|
Inter-American Treaty of Reciprocal Assistance (Rio Pact)
|
|
1948–1954
|
Western Union (WU)
[note 6]
|
Belgium
France
Luxembourg
Netherlands
United Kingdom
|
1949
|
North Atlantic Treaty Organization (NATO)
[note 7]
|
|
1949–1989
|
Secret Swedish–American Alliance
[4]
|
Sweden
United States
|
1950–1979
|
Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance
|
China
Soviet Union
|
1951
|
Mutual Defense Treaty (United States–Philippines)
|
Philippines
United States
|
1951
|
ANZUS Treaty
|
Australia
New Zealand (partially suspended)
United States (partially suspended)
|
1951
|
US–Japan Alliance
|
Japan
United States
|
1952
|
Brazil–United States Treaty
|
Brazil
United States
|
1952
|
US–Israel Mutual Defense Assistance Agreement
[5]
|
Israel
United States
|
1953
|
Mutual Defense Treaty (United States–South Korea)
|
South Korea
United States
|
1953
|
United Nations Command
|
|
1953–1956
|
Agreement of Friendship and Cooperation
|
Greece
Turkey
Yugoslavia
|
1954
|
Mutual Defense Assistance Agreement (United States–Pakistan)
|
Pakistan
United States
|
1954–1977
|
Southeast Asia Treaty Organization (SEATO)
|
|
1954–2011
|
Western European Union (WEU)
|
|
1955–1979
|
Central Treaty Organization (CENTO), previously known as the
Middle East Treaty Organization (METO)
|
Iran
Iraq (withdrew in 1959)
Pakistan
Turkey
United Kingdom
|
1955–1991
|
Treaty of Friendship, Cooperation and Mutual Assistance (Warsaw Pact)
|
|
1955–1975
|
Simonstown Agreement
|
South Africa
United Kingdom
|
1955–1980
|
Mutual Defense Treaty between the United States and the Republic of China
|
China (Republic of China)
United States
|
1957–1967
|
Anglo-Malayan Defence Agreement
|
Malaya
United Kingdom
|
1958–1962
|
Anglo-Nigerian Defence Agreement
[6]
|
Nigeria
United Kingdom
|
1958
|
US–UK Mutual Defence Agreement
|
United Kingdom
United States
|
1960
|
Treaty of Mutual Cooperation and Security between the United States and Japan
|
Japan
United States
|
1961
|
Sino-North Korean Mutual Aid and Cooperation Friendship Treaty
|
China
North Korea
|
1962
|
Thanat–Rusk Communiqué
|
Thailand
United States
|
1964–1979
|
Anglo-Maltese Defence Agreement
[7]
|
Malta
United Kingdom
|
1967–1972
|
Egypt–Jordan Mutual Defense Agreement
[8]
|
Egypt
Jordan
|
1968–1974
|
Mauritius–United Kingdom Mutual Defence and Assistance Agreement
[9]
[10]
|
Mauritius
United Kingdom
|
1970–1974
|
Alcora Exercise
|
Portugal
Rhodesia
South Africa
|
1971
|
Five Power Defence Arrangements
|
Australia
Malaysia
New Zealand
Singapore
United Kingdom
|
1975–1994
|
Israel–South Africa Agreement
|
Israel
South Africa
|
1979
|
Taiwan Relations Act
|
Taiwan
United States
|
1982
|
Regional Security System (RSS)
|
|
1984
|
Peninsula Shield Force
|
Bahrain
Kuwait
Oman
Qatar
Saudi Arabia
United Arab Emirates
|
1992
|
Collective Security Treaty Organization (CSTO)
|
|
1997
|
Union State
|
Belarus
Russia
|
1999
|
European Union (EU)
[note 8]
|
[11]
|