MOSCOW, June 23 (RAPSI) - Russian opposition activist Stepan Zimin, who has received a 42-month sentence for participation in 2012 riots in central Moscow, on Tuesday was released  from prison, his lawyer, Sergei Panchenko, told RAPSI.

Earlier, the Tver Region Court granted a motion filed by Zimin to release him on parole.

Over 400 people were arrested and scores injured in the Bolotnaya Square protest that turned violent in May 2012. Dozens were later charged with inciting mass riots and using violence against law enforcement officers.

Riot organizers Sergei Udaltsov and Leonid Razvozzhayev were sentenced to 4.5 years in prison each, based partly on testimony by Konstantin Lebedev, who was sentenced to 2.5 years in prison but has been released on parole.

Other participants received prison terms ranging from suspended sentences to four years. Several defendants were pardoned; one is undergoing compulsory mental treatment.