You have to download the russian prompts (search the internet, I don't know where to download them), and put them in: /var/lib/asterisk/sounds/ru
And if you do all the above mentioned, you should get russian propts.
I am unsure anyone can tell you if there is Russian language in there if they have not used it before, I know I can't. Unless you try it, you will never know if there is Russian language in there. And if you find out there is none, at least you will then know your next step is to buy the Russian language pack if there is one or make yours if there isn't.