US Spied on Medvedev at 2009 G20 Summit

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". According to the leaked documents viewed by the British paper, the details of the intercept of Medvedev’s communications were set out in a briefing prepared by the US National Security Agency (NSA), and shared with high-ranking officials from Britain, Australia, Canada and New Zealand. The document entitled "Russian Leadership Communications in support of President Dmitry Medvedev at the G20 summit in London – Intercept at Menwith Hill station" was drafted in August 2009, four months after the Russian president attended the London G20 summit.

http://www.guardian.co.uk/world/2013/jun/16/nsa-dmitry-medvedev-g20-summit
http://rt.com/news/nsa-spied-medvedev-g20-789/