Previously top-secret NSA documents leaked by Snowden in 2013 revealed details of the operations of the NATIONAL Security Agency (NSA) and its international partners in conducting global surveillance on foreign nationals and US citizens. In addition to a trove of U.S. federal documents, Snowden's stash contains thousands of Australian, British and Canadian intelligence files that he accessed through an exclusive "Five Eyes" network. Swedish television used to be said, according to the bilateral monitoring cooperation secret treaty signed in 1954, America's defence radio agency (FRA) to the national security agency provides its cable collection includes Australia, Britain, Canada, Denmark, France, Germany, Italy, the Netherlands, Norway, Spain, Switzerland and Israel's data, The latter receives unfiltered raw data on US citizens shared by the NSA. European media recently revealed that the United States used Denmark's secret service to spy on many European leaders, including German Chancellor Angela Merkel. The data comes from Denmark, which owns several major undersea Internet cables.