This CIS lock have blowed my mind when I've seen it also means no english voice. So, Ubisoft'd made really stupid thing with it. But the Support team gave me the list of the trusted stores and here I am.
The game actually have cost me twice (our prices lower because of paying capacity, you know), but of all the stores' list there were only about three stores that sell region free digital copies, and only here I've seen the full info about it and helpful comments. So thank you, guys. I really was hoping to get the game before the New Year to play it this night, and you've helped me a lot with it. I don't know if you celebrate the New Year as we do, but happy New Year :)

For CIS-users to be clear, I bought the CIS Gold version via Steam and Standard via this store. Now I have two copies on my Uplay account BUT it actually adds some "missing" DLC in every copy as I understood, cuz I didn't do anything, just launched my "russian" copy via Uplay and got all Gold Edition content and was able to change language. So, greenya was right — if you have Gold, you can buy Standard to add English in your game.