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Eight nations signed a collective-defense treaty in Manila to create the Southeast Asia Treaty Organization (flag pictured), modelled on NATO.

Collective security

International security arrangement

Collective security is arrangement between states in which the institution accepts that an attack on one state is the concern of all and merits a collective response to threats by all. Collective security was a key principle underpinning the League of Nations and the United…
Source: Wikipedia (CC BY-SA)

Manila

Capital of the Philippines

Manila, officially the City of Manila, is the capital and second-most populous city of the Philippines after Quezon City, with a population of 1,902,590 people in 2024. Located on the eastern shore of Manila Bay on the island of Luzon, it is classified as a highly urbanized…
Source: Wikipedia (CC BY-SA)

Southeast Asia Treaty Organization

Collective defense organization (1955–1977)

The Southeast Asia Treaty Organization (SEATO) was an international organization for collective defense in Southeast Asia created by the Southeast Asia Collective Defense Treaty signed in September 1954 in Manila, Philippines. The formal institution of SEATO was established on…
Source: Wikipedia (CC BY-SA)

NATO

Intergovernmental military alliance

The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance between 32 member states—30 in Europe and 2 in North America. Founded in the aftermath of World War II, NATO was established with the signing of the North…
Source: Wikipedia (CC BY-SA)