Medvedev (Sean Gallup/Getty Images)

The National Security Agency and Britain's Government Communications Headquarters joined forces to spy on world leaders and diplomats who gathered in London for two G20 summits in 2009, according to documents leaked by NSA whistle-blower Edward Snowden. Spymasters reportedly set up fake Internet cafes where keylogging software recorded diplomats' online activities; hacked into delegates' BlackBerrys to monitor e-mails and phone calls in real time; and eavesdropped on purportedly secure phone calls to Moscow made by then-Russian President Dmitry Medvedev.

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