As a person who has a couple of friends in Russia, who use PCs for mining I can tell you that there are no strict rules against bitcoin. They told me that there are some difficulties in exchanging it for cash, but nothing more than that.
Difficulties in exchanging the coins for cash? It is not that difficult. Localbitcoins is very active in Russia with thousands of users. However, bank withdrawals from BTC-E takes a lot of time.