The details of the intercept were set out in a briefing prepared by the National Security Agency (NSA), America’s biggest surveillance and eavesdropping organisation, and shared with high-ranking officials from Britain, Australia, Canada and New Zealand.
The document, leaked by the NSA whistleblower Edward Snowden and seen by the Guardian, shows the agency believed it might have discovered “a change in the way Russian leadership signals have been normally transmitted”.
The disclosure underlines the importance of the US spy hub at RAF Menwith Hill in Harrogate, North Yorkshire, where hundreds of NSA analysts are based, working alongside liaison officers from GCHQ…
It has often been described as the biggest surveillance and interception facility in the world, and has 33 distinct white “radomes” that house satellite dishes. A US base in all but name, it has British intelligence analysts seconded to work alongside NSA colleagues, though it is unclear how the two agencies obtain and share intelligence – and under whose legal authority they are working under.
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