There is actually a spelling mistake in the sollution :P

We congratulate you on solving this simple subsitution cipher. We have greater plans for you. You are about to receive a one time oppurtunity. You must not mail. Greetings from your comrades

Well that was easy. This guy is obviously stupid. It had nothing to do with Russian.

EDIT: Bah, KV beat me to it. He is more of a code breaker than me!