Until 2008, Denis served in the 8th Directorate of the Security Department, ensuring the security of diplomatic missions, consulates of foreign states and facilities of primary national importance in the Republic of Belarus.
In June 2023, he was convicted in absentia on politically motivated terrorism charges and a number of criminal charges. He was given a long prison term, the first five years of which were to be in prison. He was also stripped of his military rank.
According to the indictment, from July 2020 to January 2022, an "organized criminal group" allegedly preparing extremist crimes operated in Belarus, Turkey, Poland, Ukraine and other countries. It included radical military personnel, security officials, athletes and businessmen who sought to seize power illegally. This case is related to the attempted arson of the house of MP Oleg Gaidukevich in June 2021 and the "organization of mass riots."
