It was bound to happen, in fact, it's surprising it took this long, not that it could have happened overnight.
President Clinton (Bill Cinton, Hillary's husband who was president from 1993 to 2001) had privately told Boris Yeltsin something about that he doesn't think Putin has democracy at heart. In fact, Yeltsin later came to regret having picked Putin as his successor.
Putin has openly stated that the dissolution of the USSR was a mistake for Russia. He has made no secret that he wishes to rebuild that empire. You don't get to do that without bumping some heads along the way.