Resident of Crimea. An engineer by education. He was detained on 7 July 2020 and placed under house arrest the next day on charges of organising activities of a terrorist organisation. On 24 August 2021, the case was returned to the prosecutor's office because the materials were not recorded in Braille - Sizikov was blinded as a result of a traffic accident. On 27 October, the appeal court overturned this decision. On 17 May 2024, he was sentenced to 17 years' imprisonment in a strict regime colony, with the first four years to be served in prison. On 14 September 2024, the day after the appeal court left the sentence unchanged, Sizikov was taken into custody.