Sergei Barsov (or Sergei Borzov in the novelization) is a fictional Soviet agent and Major Anya Amasova's lover. He appears in the 1977 James Bond film The Spy Who Loved Me and its accompanying novelization and was portrayed by Michael Billington.
After making love to his girlfriend, Anya Amasova, Barsov leaves to complete a mission in Austria, which was to kill James Bond. He and his minions tried to kill him on a downhill ski chase in Austria, but James killed him and escaped.
Sergei was a member of Otdyel II, the operations and executions branch of SMERSH in the film novelization of The Spy Who Loved Me, but was never mentioned as a member in the actual film. Borzov was the romantic love interest of Agent XXX before being killed by James Bond in the opening sequence.