Sergei was arrested in August 2021 for displaying a sign reading "Usurper" in a public place and was remanded in custody pending trial.
In November 2021, he was found guilty of slandering Lukashenko and sentenced to restricted freedom in an open correctional facility.
In the spring of 2023, a court hearing was held to discuss increasing his sentence.
He was released in early 2024, having fully served his sentence as determined by the court.
In April 2024, it was announced that Sergei had been tried again. According to the charges, on April 7, 2024, he stood with a poster at the entrance to the Miory District Administration building. The exact words on the poster are unknown. At the court hearing on April 10, Sergei confirmed that he had indeed been holding the poster. As a result, he was sentenced to 15 days of administrative arrest.
