Always striving for a more authentic experience in my videogames, I came across this:
This'll enable the ability to switch to "Russian" voiceovers (under the audio settings) for gameplay, allowing the Russian team to actually speak Russian. The only downside is that the US team will also start speaking with a slavic tongue as well, so you're going to have to switch the settings every time you change teams. (these are the actual sound files for the Russian version of the game)
I tried it out on a game last night and have to stay I felt more immersed than before. Dice always had good non-English voiceovers in their games (BF2 and BC2 come to mind) and these are no different.