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Countries with Collective Security Treaties

Collective defense is when an attack on one country requires intervention by another.
Source: https://en.wikipedia.org/wiki/List_of_military_alliances
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SomeNerd
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Last updated: December 23, 2025
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First submittedApril 6, 2024
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Date:
Treaty
Country
1940
Ogdensburg Agreement
Canada
United States
1943
Five Eyes
Australia
Canada
New Zealand
United Kingdom
United States
1947
Rio Pact
Argentina
Bahamas
Brazil
Chile
Colombia
Costa Rica
Dominican Republic
El Salvador
Guatemala
Haiti
Honduras
Panama
Paraguay
Peru
Trinidad and Tobago
United States
Uruguay
1949
NATO
Albania
Belgium
Bulgaria
Canada
Croatia
Czechia
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Iceland
Italy
Latvia
Lithuania
Luxembourg
Montenegro
Netherlands
North Macedonia
Norway
Poland
Portugal
Romania
Slovakia
Slovenia
Spain
Sweden
Turkey
United Kingdom
United States
1951
Mutual Defense Treaty
Philippines
United States
1951
ANZUS
Australia
New Zealand
United States
1951
_____–_____ Alliance
Japan
United States
1953
Mutual Defence Treaty
South Korea
United States
1958
_____-_____ Mutual Defence Agreement
United Kingdom
United States
1961
_____-_____ Treaty of Friendship, Co-operation, and Mutual Assistance
China
North Korea
1962
Thanat–Rusk Communiqué
Thailand
United States
1982
Regional Security System
Antigua and Barbuda
Barbados
Dominica
Grenada
Guyana
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
1984
Peninsula Shield Force
Bahrain
Kuwait
Oman
Qatar
Saudi Arabia
United Arab Emirates
1986; 1994
Compact of Free Association
Marshall Islands
Micronesia
Palau
United States
1992
CSTO
Belarus
Kazakhstan
Kyrgyzstan
Russia
Tajikistan
1999
European Union
Austria
Belgium
Bulgaria
Croatia
Cyprus
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Ireland
Italy
Latvia
Lithuania
Luxembourg
Netherlands
Poland
Portugal
Romania
Slovakia
Slovenia
Spain
Sweden
2010
Agreement on Strategic Partnership and Mutual Support
Azerbaijan
Turkey
2021
_____-_____ defence agreement
France
Greece
2022
_____-______ Defence Agreement
Sweden
United Kingdom
2022
____-____ Mutual Defence Agreement
Oman
United Kingdom
2023
Alliance of Sahel States
Burkina Faso
Mali
Niger
2024
Treaty on Comprehensive Strategic Partnership between _____ and _____
North Korea
Russia
2025
Pukpuk Treaty
Australia
Papua New Guinea
2025
Strategic Mutual Defence Agreement
Pakistan
Saudi Arabia
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