On September 11, 2013, The Guardian published a leaked edward Snowden document revealing a similar agreement between the NSA and Israel`s 8200 unit.   Some sources make Canada the “second part” of the agreement (see z.B The U.S. Intelligence Community, p. 267.). However, it appears that Canada is not a signatory to the UKUSA agreement itself. Prime Minister Pierre Trudeau expressly stated this in 1974 (House of Commons, January 10, 1974, p. 9227.). Former CSE chief Kevin O`Neill told author James Littleton that “the UKUSA agreements directly link the UK and the US. Canada is less formally involved. The agreements to which Canada is a part do not exist on paper.
There is not a single document that gives its terms. But they still exist as an agreement between the SIGINT organizations of the five English-speaking nations. (James Littleton, Target Nation: Canada and the Western Intelligence Network, Lester and Orpen Dennys, 1986, 95.) Canadian participation in the broader ukusa alliance was established in 1975 by hon.C.M. (Bud) Drury confirmed (C.M. Drury, Testimony, Minutes of Proceedings and Evidence of the Standing Committee on Miscellaneous Estimates, March 24, 1975, p. 18:20).). In addition, the Assistant Secretary, Security and Intelligence, officially confirmed in 1995 that “Canada is working with some of its closest and long-standing allies in the exchange of foreign intelligence… These countries and the relevant authorities are the United States (National Security Agency), the Government Communications Headquarters (Government Communications Headquarters), Australia (Defence Signals Directorate) and New Zealand (Government Communications Security Branch [sic]). (Statement by The Assistant Officer, Security and Intelligence Services to the Standing Committee on National Defence and Veterans Affairs, May 2, 1995.) Although its existence has long been known, the agreement, which was negotiated in London in March 1946, is only published now and is officially recognized for the first time, after questioning Britain and the United States on freedom of information. As part of the agreement, countries agreed to exchange knowledge on operations related to the interception, decryption and translation of foreign communications, including the “acquisition of documents and communication equipment.”