sentences:  Leonid Leonov (1899 — 1994) was a Soviet novelist and playwright.His novel "The Russian Forest" (1953) was acclaimed by the authorities as a model Soviet book on World War II and received the Lenin Prize, but its implication that the Soviet regime had cut down "the symbol of Old Russian culture" caused some nervousness, and Nikita Khrushchev reminded the author that "not all trees are useful ... from time to time the forest must be thinned.