While still studying at the Vaganova Academy, in 1942, he was allowed to perform with the Kirov Ballet due to the lack of male dancers during World War II.
During his solo career he sought roles that required personality and acting gifts, such as the lead in Shuraleh by Leonid Yakobson (1950) and Negro Mako in The Path of Thunder by Konstantin Sergeyev (1958).
This work was characterized by a simple and clear style, lacking a clutter of props characteristic of the time; it became a great success, launching his directing career.
[1][3] In parallel, Belsky had a long career as a teacher, which started with character dance in 1946 at the Vaganova School and continued from 1966 at the St. Petersburg Conservatory.
He was survived by his wife, Lyudmila Alekseeva, a solo dancer from the Kirov Ballet, and a son Nikita.