NATO , Nato
n acronym for North Atlantic Treaty Organization, an international organization composed of the U.S., Canada, Britain, and a number of European countries: established by the North Atlantic Treaty (1949) for purposes of collective security. In 1994 it launched the partnerships for peace initiative, in order to forge alliances with former Warsaw Pact countries; in 1997 a treaty of co-operation with Russia was signed and in 1999 Hungary, Poland, and the Czech Republic became full NATO members
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