I am a native Russian speaker, born, raised, and educated in Russia, and a fluent English speaker (I've lived in USA for many years already, and I was a professional translator from/into English long before I moved to the States). I used to work as a translator in Moscow. It would be my pleasure to communicate with your clients for you.
P.S. I am the actual translator who would do the work, not an agency. Don't pay a middleman; they will outsource the job to the cheapest guy they can find to make a profit out of it, guess what kind of quality this would mean. Feel free to call me on skype or phone and verify for yourself that I am actually a native Russian speaker.
Here are some of my translations from English to Russian, out of many:
https://www.freelancer.com/jobs/Website-Design/Website-brief-translation-from-English/
https://www.freelancer.com/projects/Translation/Math-article-translation-from-English/
https://www.freelancer.com/jobs/Translation/Translation-game-from-English-into/
https://www.freelancer.com/jobs/Translation/English-Russian-7290990/