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On April 4, 1949, the leaders of 12 countries signed the North Atlantic Treaty in Washington. In some sources, this document is referred to as the Washington Treaty. The basis of this political and military alliance is Article 5, which guarantees the collective defense of the treaty participants. On April 4, 1949, the leaders of 12 countries signed the North Atlantic Treaty in Washington. In some sources, this document is referred to as the Washington Treaty. The basis of this political and military alliance is Article 5, which guarantees the collective defense of the treaty participants. #politics #history #nato