Solid silver sarcophagus of Alexander Nevsky, Hermitage Museum, Saint Petersburg.  Nevsky is a controversial figure in Russian history.  On the one hand, he saved part of Russia from conquest by Swedes and Germans, which endeared him to Russians and made him a saint of the Russian Orthodox Church.  On the other hand, however, he collaborated with the Mongols! and served as their hand-picked man in ruling Russia.

In Eisenstein's 1938 movie, Alexander Nevsky, the hero excuses his actions by suggesting that the Mongols are a temporary nuisance who will eventually go away but the Germans and Swedes, if they should conquer any part of Russia, would stay forever.  Considering that the Mongols stayed for over 200 years but the Swedes who did conquer parts of Russia were expelled in a fraction that time, the Soviet excuse for Nevsky's collaboration seems questionable policy at best, and contemptible rationalization at worst.