List of military alliances

This is the list of military alliances. A military alliance is a formal agreement between two or more parties concerning national security in which the contracting parties agree to mutual protection and support in case of a crisis that has not been identified in advance. Military alliances differ from coalitions, which are formed for a crisis that already exists. Numerous forms of military and defensive alliances have existed between states since early human history. This is a comprehensive list of the most important alliances.

Military alliances shortly before World War I. Germany and the Ottoman Empire allied after the outbreak of war.

Legend

Legend
Active military alliances

Before AD 1200

YearsNameMembers
c. 7th century–338 BCLatin LeagueAbout 30 villages and tribes in the region of Latium
c. 6th century–338 BCPeloponnesian LeagueVarious city-states in the Peloponnese, dominated by Sparta
493 BCFoedus CassianumRoman Republic
Latin League
478–404 BCDelian LeagueSee Members of the Delian League
215 BCMacedonian–Carthaginian TreatyMacedonia
Carthage
433–554Silla-Baekje Alliance Silla
Baekje
1123Pactum Warmundi  Kingdom of Jerusalem
 Republic of Venice
1167–1250Lombard LeagueNumerous cities in medieval Lombardy, modern Northern Italy

1200–1699

YearsNameMembers
1266–1320Byzantine-Mongol Alliance  Byzantine Empire
 Golden Horde
1295–1560Auld Alliance Kingdom of Scotland
Kingdom of France
1367–1385Confederation of CologneCities of the Hanseatic League
1373Anglo-Portuguese Treaty of 1373 Kingdom of Portugal
Kingdom of England
1386Treaty of Windsor[note 1] Kingdom of Portugal
Kingdom of England
1489Treaty of Dordrecht  Holy Roman Empire
 Kingdom of England
1499Treaty of Blois Kingdom of France
 Republic of Venice
1508–1510League of Cambrai Papal States
Kingdom of France
Aragon
 Holy Roman Empire
1511–1513Catholic League (Italian) Papal States
 Republic of Venice
 Kingdom of England
Aragon
 Holy Roman Empire
1524–1525Franco-Polish alliance Kingdom of France
 Crown of Poland
1528Franco-Hungarian alliance Kingdom of France
 Kingdom of Hungary
1531–1547Schmalkaldic LeagueVarious Protestant German States of the Holy Roman Empire
1536–1798Franco-Ottoman alliance Kingdom of France
Ottoman Empire
1571–1573Holy League Papal States
Spain
 Republic of Venice among others
1596–1604Triple Alliance (1596)  Dutch Republic
 Kingdom of France
 Kingdom of England
1608–1621Protestant UnionVarious Protestant German States of the Holy Roman Empire
1609–1635Catholic League (German)Various Catholic German States of the Holy Roman Empire
1631–1639Treaty of Fontainebleau  Kingdom of France
 Electorate of Bavaria
1654Anglo-Swedish Alliance Sweden
England
1656Treaty of Marienburg Sweden
Brandenburg-Prussia
1668–1672Triple Alliance  Kingdom of England
 Sweden
 Dutch Republic
1684–1699Holy League  Holy Roman Empire
 Polish-Lithuanian Commonwealth
 Republic of Venice
Tsardom of Russia
1689–1713League of Augsburg  Kingdom of England
 Dutch Republic
 Holy Roman Empire
1699Treaty of Preobrazhenskoye  Denmark-Norway
Tsardom of Russia
 Electorate of Saxony
 Polish-Lithuanian Commonwealth

1700–1899

YearsNameMembers
1716–1731Anglo-French Alliance  Kingdom of France
 Kingdom of Great Britain
1717–1718Triple Alliance (1717)  Dutch Republic
 Kingdom of France
 Kingdom of Great Britain
1731–1756Anglo-Austrian Alliance  Kingdom of Great Britain
 Holy Roman Empire
1747–1748Convention of Saint Petersburg  Kingdom of Great Britain
 Russian Empire
 Dutch Republic
1756–1762Anglo-Prussian Alliance (1756)  Kingdom of Great Britain
Kingdom of Prussia
1756–1792Franco-Austrian Alliance  Kingdom of France
 Holy Roman Empire
1764–1788Russo-Prussian alliance  Russian Empire
Kingdom of Prussia
1773–1810Treaty of Tsarskoye Selo  Russian Empire
Denmark–Norway
1778–1800Treaty of Alliance United States
 Kingdom of France
1779–1783Treaty of Aranjuez  Kingdom of France
 Kingdom of Spain
1781–1790Austro-Russian Alliance  Russian Empire
 Holy Roman Empire
1786Moroccan–American Treaty of Friendship  Morocco

United States

1788–1791Anglo-Prussian Alliance (1788)  Kingdom of Great Britain
Kingdom of Prussia
1788–1791Triple Alliance (1788)  Kingdom of Great Britain
Kingdom of Prussia
 Dutch Republic
1790–1792Polish–Prussian alliance Kingdom of Prussia
 Polish-Lithuanian Commonwealth
1795Treaty of Peace and Friendship between the United States and the Regency of Algiers United States
Regency of Algiers
1807Russo-Serbian Alliance  Russian Empire
 Revolutionary Serbia
1815–1818The Quadruple Alliance  United Kingdom
 Austrian Empire
 Kingdom of Prussia
 Russian Empire
1815–1825[note 2]Holy Alliance  Russian Empire
 Kingdom of Prussia
 Austrian Empire
1865–1872Triple Alliance of 1865 Brazil
 Uruguay
 Argentina
1866–1868First Balkan Alliance  Kingdom of Greece (1867)
 Principality of Montenegro (1866)
 Principality of Serbia
1867–1868Greek–Serbian Alliance of 1867  Kingdom of Greece
 Principality of Serbia
1873Treaty of Defensive Alliance (Bolivia–Peru)  Bolivia
Peru
1873–1887League of the Three Emperors  Russian Empire
Austria-Hungary
 German Empire
1879–1918Dual Alliance Austria-Hungary
 German Empire
1881–1908Austro–Serbian Alliance Austria-Hungary
 Principality of Serbia
1882–1914Triple Alliance  German Empire
Austria-Hungary
Kingdom of Italy
1892Treaty of Nice  French Third Republic
Kingdom of Italy
1892–1917Franco-Russian Alliance  French Third Republic
 Russian Empire

1900–1999

YearsNameMembers
1902–1923Anglo-Japanese Alliance Japan
 United Kingdom
1904Entente Cordiale[note 3]  France
 United Kingdom
1904Treaty of Sofia  Principality of Bulgaria
Kingdom of Serbia
1907–1917Triple Entente France
 Russian Empire
 United Kingdom
1912–1913Balkan League  Kingdom of Bulgaria
Greece
Kingdom of Montenegro
Kingdom of Serbia
1913–1914Greek–Serbian Alliance Greece
Serbia
1914–1918Central Powers  German Empire
Austria-Hungary
 Ottoman Empire
1914–1918Ottoman–Bulgarian alliance  Bulgaria
 Ottoman Empire
1915–1918Bulgaria–Germany treaty (1915)  Bulgaria
 German Empire
1915–1918German–Ottoman alliance  German Empire
 Ottoman Empire
1916–1918Treaty of Bucharest (1916) France
Italy
Romania
 Russian Empire
 United Kingdom
1920–1921Polish-Ukrainian Agreement Poland
Ukraine
1920–1938Little Entente Czechoslovakia
Romania
Yugoslavia
1920–1940Franco-Polish Alliance (1921) France
Poland
1920–1921Georgian–Polish alliance Georgia
Poland
1921–1939Polish–Romanian alliance Poland
Romania
1922–1930Anglo-Iraqi Treaty of 1922 Iraq
 United Kingdom
1924–1938Treaty of Alliance and Friendship between France and Czechoslovakia Czechoslovakia
France
1930–1939/40Finnish–Estonian defence cooperation  Estonia
 Finland
1930–1947Anglo-Iraqi Treaty of 1930 Iraq
 United Kingdom
1934–1938Balkan Pact Greece
Romania
 Turkey
Yugoslavia
1934–1938Rome Protocols Austria
Hungary
Italy
1934–1935Stresa Front France
Italy
 United Kingdom
1935–1938Czechoslovak–Soviet Treaty of Mutual Assistance Czechoslovakia
Soviet Union
1935–1939Franco-Soviet Treaty of Mutual Assistance France
Soviet Union
1936–1956Anglo-Egyptian Treaty of 1936 Egypt
 United Kingdom
1939–1944Anglo-Polish alliance Poland
 United Kingdom
1939–1945Iberian Pact  Portugal
Spain
1939–1940Soviet–Estonian Mutual Assistance Treaty  Estonia
 Soviet Union
1939–1940Soviet–Latvian Mutual Assistance Treaty  Latvia
 Soviet Union
1939–1940Soviet–Lithuanian Mutual Assistance Treaty  Lithuania
 Soviet Union
1939–1949[note 4]Pact of Steel Germany
Italy
1940Ogdensburg Agreement  Canada
 United States
1940–1945Tripartite Pact

Bulgaria
Croatia
Germany
Hungary
Italy
Japan
Romania
Slovakia
Yugoslavia[note 5]

1941–1945Anglo-Soviet Agreement  Soviet Union
 United Kingdom
1942–1945Anglo-Soviet Treaty of 1942  Soviet Union
 United Kingdom
1942–1945Declaration by United Nations
1942–1945Croatian–Romanian–Slovak friendship proclamation Croatia
Romania
Slovakia
1943Five Eyes  Australia
 Canada
 New Zealand
 United Kingdom
 United States
1946–1948Treaty of London (1946)[1]  Jordan
 United Kingdom
1947–1957UK–Ceylon Defence Pact[2][3]  Ceylon
 United Kingdom
1947–1997Treaty of Dunkirk  France
 United Kingdom
1947Inter-American Treaty of Reciprocal Assistance (Rio Pact)
List
1948–1954 Western Union[note 6]  Belgium
 France
 Luxembourg
 Netherlands
 United Kingdom
1949 North Atlantic Treaty Organization (NATO)[note 7]
List
1949–1989Secret Swedish–American Alliance[4]  Sweden
 United States
1950–1979Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance  China
 Soviet Union
1951Mutual Defense Treaty (United States–Philippines)  Philippines
 United States
1951ANZUS Treaty  Australia
 New Zealand
 United States
1951US–Japan Alliance  Japan
 United States
1952Brazil–United States Treaty  Brazil
 United States
1952US–Israel Mutual Defense Assistance Agreement[5]  Israel
 United States
1953Mutual Defense Treaty (United States–South Korea)  South Korea
 United States
1953United Nations Command
1953–1956Agreement of Friendship and Cooperation Greece
 Turkey
Yugoslavia
1954Mutual Defense Assistance Agreement (United States–Pakistan)  Pakistan

 United States

1954–1977 Southeast Asia Treaty Organization (SEATO)
1954–2011 Western European Union
List
1955–1979 Middle East Treaty Organization (METO) Iran
 Iraq (withdrew in 1959)
 Pakistan
 Turkey
 United Kingdom
1955–1991Warsaw Pact
List
1955–1975Simonstown Agreement South Africa
 United Kingdom
1955–1980Mutual Defense Treaty between the United States and the Republic of China China (Republic of China)
 United States
1957–1967Anglo-Malayan Defence Agreement  Malaya
 United Kingdom
1958–1962Anglo-Nigerian Defence Agreement[6]  Nigeria
 United Kingdom
1958US–UK Mutual Defence Agreement  United Kingdom
 United States
1960Treaty of Mutual Cooperation and Security between the United States and Japan  Japan
 United States
1961Sino-North Korean Mutual Aid and Cooperation Friendship Treaty  China
 North Korea
1962Thanat–Rusk Communiqué  Thailand
 United States
1964–1979Anglo-Maltese Defence Agreement[7]  Malta
 United Kingdom
1967–1972Egypt–Jordan Mutual Defense Agreement[8]  Egypt
 Jordan
1968–1974Mauritius–United Kingdom Mutual Defence and Assistance Agreement[9][10]  Mauritius
 United Kingdom
1970–1974Alcora Exercise  Portugal
 Rhodesia
 South Africa
1971Five Power Defence Arrangements  Australia
 Malaysia
 New Zealand
 Singapore
 United Kingdom
1975–1994Israel–South Africa Agreement  Israel
 South Africa
1979Taiwan Relations Act  Taiwan
 United States
1982Regional Security System
List
1984Peninsula Shield Force  Bahrain
 Kuwait
 Oman
 Qatar
 Saudi Arabia
 United Arab Emirates
1992Collective Security Treaty Organization (CSTO)  Armenia
 Belarus
 Kazakhstan
 Kyrgyzstan
 Russia
 Tajikistan
1997Union State  Belarus
 Russia
1999  European Union[note 8]
List
[11]

2000–present

YearsNameMembers
2009Nordic Defence Cooperation  Denmark
 Finland
 Iceland
 Norway
 Sweden
2010Agreement on Strategic Partnership and Mutual Support[note 9]  Azerbaijan
 Turkey
2010Lancaster House Treaties  France
 United Kingdom
2010Central European Defence Cooperation  Austria
 Croatia
 Czech Republic
 Hungary
 Slovakia
 Slovenia
2014Enhanced Defense Cooperation Agreement  Philippines
 United States
2015Islamic Military Counter Terrorism Coalition
2015Russia–Syria–Iran–Iraq coalition  Iran
 Iraq
 Russia
 Syria
 Hezbollah
2015–2020US–Afghanistan Strategic Partnership Agreement Afghanistan
 United States
2020Lublin Triangle  Lithuania
 Poland
 Ukraine
2021Franco-Greek defence agreement  France
 Greece
2021US-Greece Mutual Defense Cooperation Agreement[12]  USA
 Greece
2021AUKUS  Australia
 United Kingdom
 USA
2021Shusha Declaration  Azerbaijan
 Turkey
2021Israel-United Kingdom Defence Pact[13][14]  Israel
 United Kingdom
2021US-Jordan Defense Cooperation Agreement[15]  Jordan
 United States
2022British–Polish–Ukrainian trilateral pact  Poland
 Ukraine
 United Kingdom[16]
2022Treaty of Friendship, Cooperation and Mutual Assistance between the Russian Federation and the Lugansk People's Republic[17][18] Luhansk
 Russia
2022Treaty of Friendship, Cooperation and Mutual Assistance between the Russian Federation and the Donetsk People's Republic[17][18] Donetsk
 Russia
2022Solomon Islands-China Security Pact[19][20]  China
 Solomon Islands
2022UK-Sweden Defence Agreement[21][22]  Sweden
 United Kingdom
2022UK-Finland Defence Agreement[23][22]  Finland
 United Kingdom
2022UK-Oman Mutual Defence Agreement[24]  Oman
 United Kingdom
2022Egypt-Iraq-Jordan Entente[25]  Egypt
 Iraq
 Jordan
2022Japan–Australia Reciprocal Access Agreement  Australia
 Japan
2023Anglo-Japanese Reciprocal Access Agreement[26]  Japan
 United Kingdom
2023Kenya-United States Defence Agreement  United States

 Kenya

2023Anglo-Greek Defence Agreement[27][28]  Greece
 United Kingdom
2023Papua New Guinea–United States Defence Agreement[29][30]  Papua New Guinea
 United States
2023Alliance of Sahel States[31]  Burkina Faso
 Mali
 Niger
2023The Downing Street Accord between South Korea and United Kingdom[32]  South Korea
 United Kingdom
2023Sweden–United States Defense Cooperation Agreement[33]  United States
 Sweden
2023Finland–United States Defense Cooperation Agreement[34]  United States
 Finland
2023Denmark–United States Defense Cooperation Agreement[35]  United States
 Denmark
2023American–Japanese–Korean trilateral pact  United States
 Japan
 South Korea
2024Ukraine–UK Security Cooperation Agreement[36][37]  Ukraine
 United Kingdom
2024France–Ukraine Security Cooperation Agreement[38]  France
 Ukraine
2024Germany–Ukraine Security Cooperation Agreement[38]  Germany
 Ukraine
2024Denmark–Ukraine Security Cooperation Agreement[39]  Denmark
 Ukraine
2024Italy–Ukraine Security Cooperation Agreement[40]  Italy
 Ukraine
2024Canada–Ukraine Security Cooperation Agreement[41]  Canada
 Ukraine
2024France–Armenia Defence Cooperation Agreement[42][43]  France
 Armenia
2024Netherlands–Ukraine Security Cooperation Agreement[44]  Netherlands
 Ukraine
2024Anglo–Australian Defence and Security Agreement[45]  Australia
 United Kingdom

Proposed alliances

Name and descriptionCountries
CANZUK is a proposed alliance between four Commonwealth realms.  Australia
 Canada
 New Zealand
 United Kingdom
United States–Israel Strategic Partnership is a proposal to make a formal alliance between the United States and Israel  Israel
 United States
France–Japan Reciprocal Access Agreement is currently being negotiated to finalize a formal alliance between Japan and France.[46]  France
 Japan
EU–UK Mutual Defence Agreement is a proposal, most notably from the Labour Party, to sign a formal alliance between the EU and the UK.[47]  European Union
 United Kingdom
Japan–Philippines Reciprocal Access Agreement has been in negotiations due to rising political tensions in the Pacific.[48][49]  Japan
 Philippines
South Korea–Japan Defense Pact[50] is a proposed alliance between South Korea and Japan in response to increased aggression from North Korea.  Japan
 South Korea
Mauritius–United Kingdom Defence Agreement is a proposal to sign a military alliance between Mauritius and the UK as part of an effort to resolve the Chagos Archipelago sovereignty dispute.[51]  Mauritius
 United Kingdom
Japan–Philippines–United States trilateral alliance is currently being negotiated in response to increased military build-up by China.[52]  Japan
 Philippines
 United States
France–Philippines Visiting Forces Agreement is being negotiated.[53]  France
 Philippines

See also

Notes

References