If you have over 3000 daily visits, you have to register. You remove anonymity and you have to keep all your data in Russia for at least 6 months.
This after a few laws that ban 4 words from being used in the arts and allow the state to shut down websites – promptly used to silence state critics.

Well done freedom!

Russia Quietly Tightens Reins on Web With ‘Bloggers Law’ – NYTimes.com.