Having a fitting release alongside the 2014 Winter Olympics in Russia, Club Penguin is now available to play in Russian at http://www.clubpenguin.com/ru/! The game itself is the same, but in Russian.
For the time being many penguin names will be “P(penguin ID)” until the usernames are approved by moderators to ensure they are appropriate. This is always a process that happens when Club Penguin launches in a new language.
If you find any bugs let me know and I will add it to the list on my Club Penguin Bugs website.