White Sun of The Desert is indeed a very good film but there are several others that might be interesting for the BOBers.
The only thing I couldn't stand was that the Russian Colonel had the same name as my favourite SF character. Vereshagin- the 'Variag'- out of Robert Frezza's, A Small Colonial War. Even if you're not into SF, do yourself a favour and read this novel and the sequel, Fire In A Farway Place.
Quiet Flows The Don is one of the better ones and it is available with English subtitles. Recommended.
Red and White is somewhat slower but still some very good- Red versus White and Green- action scenes and ready made scenarios. Again with English subtitles
Gold River is hard to find (I have a French copy) but well worth looking for. Some really great action scenes and very unusual warriors.
There's also a film about a young Mongolian boy who, inspired by his idol Genghis Khan, decides to join a band of roving, well Mongolian warriors/bandits. Not sure of the title but I believe it has 'Genghis Khan' in it.
Another Russian film is about a group of Naval soldiers defending a city (Kronstadt?) against anything the Whites can come up with. Don't have a copy anymore but I remember it as a very good action movie. Possibly only on video.