Why are interest rates so high in Russia? In Russia we currently have 11% of Central Bank's interest rate and you can get credit in commercial bank for about 25% in year. Why are interest rates so high?
I think the answer to your question does not require reference to economic theory as you are trying to understand why Russians cannot borrow at low rates. The prevailing high rates are not there for suppressing business activity, etc. This is something to do with the risk appetite of Russian commercial banks when dealing with domestic businesses. 

Why are Russians facing rates as high as 25% when the base rate is 9%?

Central Bank's current base rate is 9%, also called repo rate. This rate is the main monetary tool used by CB to influence the interbank interest rates and the interest rates for loans, mortgages and savings. As you can see, the CB rate is low, but the commercial banks are adding huge premium (here it is 16%) to the base rate when lending to domestic businesses. Perhaps, they may face high default risks, political risk, high inflation, exchange rate risk, etc.

As a side note, this is a typical characteristic of a transition economy, that's said, Russians will face relatively high interest rates till they gain 'developed' status.