It's actually not, Russian music you hear during the movie is a classic Russian rock. Also, this movie reflects post USSR era in Russia during early 90s VERY well. And it was a very moody time indeed. You know, gang wars and all that stuff. Brat 2 is somewhat more"modern". You can find it on youtube as well.
And, this epic series, I loved them back in 2005:
http://www.youtube.com/watch?v=Uu-aP8gpQG8
but you might not get em and why the reason it's cool simply because you're not Slavic. Sounds funny but that's the way it is.