The easiest way is to use Google translate:
https://translate.google.com/manager/website/add
1) very easy to implement (5 min)
2) all site content is translated
3) translations are not very good
Any other method wont work very well, because your members title, description etc can only be in 1 language (unless you build a plugin to offer users the option to submit their sites in both languages).
Its quite easy to make a language picker and load the Russian or English language file (I believe this has already been done in another thread), but that will leave your site with the VisioList interface in Russian, and your user content in English.