You guys could try to use some music from 'The Red Army Choir/ Alexandrov Ensemble'. I don't know if you can use them due to possible copyright infringement however if you can get some songs of them it would fit the game perfectly. They are the national choir of Russia so the music they play is Russian.
Example: Youtube.com
I do really like the music you made though. For non professional modders this is really good. Best mod I've seen on ModDB
Kikkers
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