Oleg Gordievsky

Oleg Antonovich Gordievsky (Russian: Оле́г Анто́нович Гордие́вский; assumed name: Anton Kelsen; 10 October 1938 – 4 March 2025) was a colonel of the KGB who became KGB resident-designate (rezident) and bureau chief in London and a British spy. Gordievsky was a double agent, providing information to the British Secret Intelligence Service (MI6) from 1974 to 1985. After being recalled to Moscow under suspicion, he was exfiltrated from the Soviet Union in July 1985 under a plan code-named Operation Pimlico. The Soviet Union subsequently sentenced him to death in absentia.

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