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Five Eyes

Five Eyes is an intelligence alliance of five English-speaking countries: the United States, the United Kingdom, Canada, Australia and New Zealand. Its roots lie in the 1946 UK–USA Agreement on signals intelligence cooperation, which was later extended to the other members. The alliance coordinates the sharing of intelligence, particularly signals intelligence (SIGINT), among the participating agencies while maintaining separate national collection systems. It operates without a published founding treaty or central body, relying instead on a series of intergovernmental arrangements and internal protocols.