Authorities have removed websites belonging to Kremlin critic Alexei Navalny and dozens of his allies. The move comes during the run-up to parliamentary elections in September

Russian regulator blocks Alexei Navalny's website

The watchdog, Roskomnadzor, said in a statement that Twitter was too slow in tackling illegal posts

Last week Roskomnadzor started disrupting Twitter's services in Russia

Late Wednesday, Twitter denounced Russia's attempts to "block and throttle online public conversation"