Siarhei is an investigative journalist and the editor-in-chief of the Belarusian online media Ejednevnik. Satsuk's latest investigation focused on corruption in the Ministry of Health. It is known that ""he spoke about unprecedented kickbacks for the supply of expensive equipment; about the purchase of an unregistered vaccine, which was actually tested on Belarusian children; and about falsification of data on the spread of COVID-19 in Belarus.""

He has heart problems, severe pain and frequent atrial fibrillation associated with coronary heart disease.