IMO, Russians goals are the roll back of NATO out of the bears backyard. Ukrainians are next. Chavez, Cuba and Iran are side shows. The real goal is probably a roll back of the Orange revolution. The Russians haven’t been shy about covertly interfering (poisoning of whats his name, Yushenko? for example). Perhaps they think this will give them an excuse for more overt moves. Counter revolution perhaps? Coup d’État perhaps? Outright invasion seems unlikely, but they do seem awfully riled up about a defensive weapons system. A successful assassination of the western installed (from their POV) president wouldn’t be surprising IMO.