"''" . . . "1949-04-04Z"^^ . "Animus in consulendo liber" . . . "The North Atlantic Treaty Organization (NATO /\u02C8ne\u026Ato\u028A/; French: Organisation du trait\u00E9 de l'Atlantique Nord; 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. The organization constitutes a system of collective defence whereby its member states agree to mutual defense in response to an attack by any external party."@en . . . . . . "1949Z"^^ . "NATO, ''" . . . "North Atlantic Treaty Organization"@en . .