The Federal Service for Supervision of Communications, Information Technology, and Mass Media may block Facebook and Twitter for violation of the Russian law. In December 2019, the President of Russia signed a law requiring internet services to transfer all Russian user data to servers located in Russia. In case of non-compliance, the regulator is authorized to fine them RUB 1-6 mio ($16K-95K), and for repeated offense, RUB 6-18 mio ($95K-190K).
January 31 is the deadline for the social media to announce their decision to transfer the databases to the Russian Federation. Otherwise, the regulator will have legal grounds to block access to the services.