'Rasputin' was a British deception, proposed by Colonel Peter Fleming’s 'D' Division, to discommode Japanese political and military thinking by 'revealing' that the British war cabinet had decided to use chemical warfare in the war against Japan after the defeat of Germany (March 1943).

The plan was also intended to cause the diversion of shipping and trained personnel, but was refused by Colonel John Bevan, head of the London Controlling Section, as it would have interfered with 'Langtoft' and might also persuade the Germans and Japanese to initiate the use of chemical weapons.