Without support escorts and the latest tracking technology protecting an aircraft carrier is next to impossible...in effect, they become one great big floating target saying - sink me! Let 'em build it and when necessary we will easily sink it along with all the rubbles they put into it. Besides, when oil prices collapse so again will the soviet - oh sorry, Russian - economy. At least the Czars dressed better than Putin...
Aircraft carrier are not built to fight great powers. One tactical nuke a mile away and they are gone.
Aircraft carrier are to project power into local conflicts ie to bully or protect small countries. Having such card facilitates the big game. Possibly if Russia had more hardware in the Adriatic the NATO would not attack Serbs.