Sergei was arrested in July 2020 in a criminal case opened for insulting Lukashenko. Before the verdict, he was under a written undertaking not to leave. Since January 2021, four closed court hearings have been held - without the participation of lawyers and witnesses. Of the 96 charges, 13 were proven. In March 2021, Sergei was sentenced to imprisonment.
He was released in August 2022, having fully served his sentence.
