Leaked documents reveal Russian president was spied on during visit, as questions are raised over use of US base in Britain.
American spies based in the UK intercepted the top-secret communications of the then Russian president, Dmitry Medvedev, during his visit to Britain for the G20 summit in London, leaked documents reveal.
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.
The document was drafted in August 2009, four months after the visit by Medvedev, who joined other world leaders in London, including the US president, Barack Obama, for the event hosted by the British prime minister, Gordon Brown.
Medvedev arrived in London on Wednesday 1 April and the NSA intercepted communications from his delegation the same day, according to the NSA paper, entitled: "Russian Leadership Communications in support of President Dmitry Medvedev at the G20 summit in London – Intercept at Menwith Hill station."
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