Sergei was arrested in May 2021 on charges of "active participation in group actions that grossly violate public order" for his participation in protests that took place in Minsk in 2020 against the election results and violence in the country by security forces. In September 2021, he was sentenced to restricted freedom with direction and released from custody in the courtroom before the verdict came into force.
In December 2024, as part of the special proceedings in Sergei's case, an in absentia court hearing was held on the issue of "replacing the restriction of freedom with referral to an open-type correctional facility with imprisonment."
