I do wonder if Putin has made the mistake of surrounding himself with yes-men and then forgetting that he may not be getting the truth from them. As in, Putin went in believing he had a righteous cause, because everyone around him is telling him that he does, because they believed he wanted to be told he did. Now he's gone past the point of no return, and may be finding out just how badly mistaken he is. Everyone who was afraid to speak in opposition now has no reason to hold back.