This clandestine campaign burst into the open in 2011 when the Kremlin expelled Harding from Moscow - the first western reporter to be deported from Russia since the days of the Cold War. Vladimir Putin's spies used tactics developed by the KGB and perfected in the 1970s by the Stasi, East Germany's sinister secret police. The break-in was the beginning of an extraordinary psychological war against the journalist and his family.
He found himself tailed by men in cheap leather jackets, bugged, and even summoned to Lefortovo, the KGB's notorious prison. Within months, mysterious agents from Russia's Federal Security Service - the successor to the KGB - had broken into his flat. In 2007 Luke Harding arrived in Moscow to take up a new job as a correspondent for the British newspaper the Guardian.