It's been rumored for days/weeks, but now it's official: Tor is blocked in Russia as of December 1, 2021.
If you'd like to help the 300,000+ people who use Tor daily in Russia, run Tor bridges !
If you can't or don't want to do it yourself, donate to Nos Onions to help the Tor network in general and thus the Russians who are suffering from this censorship.