The hearing was to consider a motion by the federal prison authority to replace a controversial 2014 suspended sentence handed to Alexei Navalny with a jail term, TASS reported.
Allies of Navalny called on his supporters to gather outside the court on Tuesday morning, Radio Free Europe/Radio Liberty said.
This footage shows police detaining a man holding a “Freedom, Freedom” sign outside the court house. The man was being interviewed by Current Time TV. Credit: Current Time TV via Storyful