Question: Vladimir Yaroshenko was a soloist with the choreographer who dominated Russian ballet for how many years?
Sentence (from "Yury Grigorovich"): Yury Nikolayevich Grigorovich (Russian: Ю́рий Никола́евич Григоро́вич ; born 2 January 1927 in Leningrad) is a Soviet and Russian dancer and choreographer who dominated the Russian ballet for 30 years.
Relevant evidence: Yes