You could use the Mod_Rewrite functionality of PHP and write your site to provide 2 versions on the content depending on the URL so you could have
http://xxx.com/en/models/.....
http://xxx.com/ru/models/.....
then pass the variable to the pages and it renders in the correct language, just choose a default one so if the URL messes up atleast the viewer can read something....
Hope this helps
Rob