I've found Russian colours to be a pain, but one of the boons about the Russians is they wear pretty much anything. I will try and figure out what I used for a Russian trooper I painted recently as a test, but I'd suggest looking at a lot of Vids/pics of the 2008 Georgian war.
But as a general idea, I think if you use a basic khaki green, with a patch of brown you can't really go wrong from there... But I'll take a detailed look when i get the time.