Medvedev and Denisov looked pretty horrible on defense. Ilya Nikulin has also slowed down from what he was in 2008 when he was great. The problem is that Russia don't really have anyone better than them in the KHL. Most of the best KHL defensemen are foreigners these days. The rest of the Russians like Konstantin Korneyev, Yakov Rylov, Nikolai Belov, Anton Belov... Well, they are not any better than Denisov and Medvedev.
Russia badly needs young stud defensemen in the national team. I doubt Russia can win any major tournament with this defense.