The United Kingdom – United States of America Agreement (UKUSA, // ew-koo-SAH) is a multilateral agreement for cooperation in signals intelligence among the United Kingdom, the United States, Canada, Australia, and New Zealand. The alliance of intelligence operations is also known as Five Eyes. It was first signed in March 1946 by the United Kingdom and the United States and later extended to encompass the three Commonwealth realms of Canada, Australia and New Zealand. The UKUSA Agreement was a follow-up of the 1943 BRUSA Agreement, the World War II agreement on cooperation over intelligence matters. This was a secret treaty, allegedly so secret that it was kept secret from the Australian Prime Ministers until 1973.
The agreement established an alliance of five English-speaking countries for the purpose of sharing intelligence, especially signals intelligence. It formalized the intelligence sharing agreement in the Atlantic Charter, signed in 1941, before the entry of the U.S. into the conflict.
The agreement originated from a ten-page British–U.S. Communication Intelligence Agreement, also known as BRUSA, that connected the signal intercept networks of the U.K. Government Communications Headquarters (GCHQ) and the U.S. National Security Agency (NSA) at the beginning of the Cold War. The document was signed on March 5, 1946 by Colonel Patrick Marr-Johnson for the U.K.'s London Signals Intelligence Board and Lieutenant General Hoyt Vandenberg for the U.S. State–Army–Navy Communication Intelligence Board. Although the original agreement states that the exchange would not be "prejudicial to national interests", the United States often blocked information sharing from Commonwealth countries. The full text of the agreement was released to the public on June 25, 2010.
Under the agreement, the GCHQ and the NSA shared intelligence on the Soviet Union, the People's Republic of China, and several eastern European countries (known as Exotics). The network was expanded in the 1960s into the Echelon collection and analysis network.
The UKUSA alliance is often associated with the ECHELON system; however, processed intelligence is reliant on multiple sources of information and the intelligence shared is not restricted to signals intelligence.
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Each member of the UKUSA alliance is officially assigned lead responsibility for intelligence collection and analysis in different parts of the globe.
Formerly the northern portions of the former Soviet Union and conducting sweeps of all communications traffic that could be picked up from embassies around the world. In the post-Cold War era, a greater emphasis has been placed on monitoring satellite, radio and cellphone traffic originating from Central and South America, primarily in an effort to track drugs and non-aligned paramilitary groups in the region.
New Zealand is responsible for the western Pacific. Listening posts in the South Island at Waihopai Valley just south-west of Blenheim, and on the North Island at Tangimoana. The Anti-Bases Campaign holds regular protests in order to have the listening posts closed down.
Europe, Africa, and European Russia.
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