Sergei is a musician, founder of the band Kasary, and festival organizer. He worked at the Belarusian State Philharmonic. After 2020, he moved to Poland. He promotes traditional Belarusian songs.
The musician also worked to help Belarusian refugees. Since 2021, the House of Creators, which he founded, has been operating in Warsaw, providing temporary accommodation for cultural figures in need of support. At the end of 2025, he also opened a shelter for released political prisoners.
Dolgushev appeared on the wanted lists of the Republic of Belarus and the Russian Federation on November 13, 2026. The exact article under which the criminal case against Sergei was opened is unknown, but the prosecution is politically motivated.
