Sergei was arrested in connection with a criminal case opened due to protests and clashes between Pinsk residents and security forces on the night of August 9-10, 2020. He was convicted of participating in "mass riots." The victims in the case included 109 police officers and officials, who, in addition to prison sentences, demanded approximately 530,000 rubles in compensation from the defendants.
He was released in April 2026, having served his full sentence.
