Grey hat solution to the problem... the guy almost certainly has enemies. Kidnap him and give him to his enemies, gift wrapped. This could be in the form of illegal extradition or rendition and deposit him at the embassy of a country were he is still wanted.

technically the worst you've done is kidnap him.. Heck, you could drug him, dump him on plane and let him walk free.. in the wrong country.

White hat solution, crack down on his fellow russians, pull them for every tiny little infraction, misdemeanor and so on.. and make sure they know it's because of their fellow's actions. Watch everything they do, intently, let them know you are watching them and aren't about to let them get away with anything, not even a broken taillight. Let his bosses know that the entirely legal harassment will continue until they do something about the a-hole.

Watch him get posted to Siberia.