What does OTAN mean?

North Atlantic Treaty Organization (NATO, Portuguese: Organização do Tratado do Atlântico Norte, OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949.
OTAN constitutes a system of collective defense whereby its member states agree to mutual defense in response to an attack by any external party.
OTAN is headquartered in Brussels, Belgium.

Note:
In English, Organização do Tratado do Atlântico Norte (OTAN) means North Atlantic Treaty Organization (NATO)
In Spanish, OTAN stands for Organización del Tratado del Atlántico Norte
In French, OTAN stands for Organisation du Traité de l'Atlantique Nord

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