If you're having trouble figuring out who you have to kill at the
St.Petersbourgh stakeout what you should do is get to the building as
quick as you can kill the guards out front silently. Then run up the
stairs ,turn left trigger if they are still in the room, kill the guy on the
opposite side of the table. If they are running down the flight of
stairs the first guy will be wearing a red leather jacket, kill the
guy behind him and run as fast as you can to the train station without
being killed.