Question: What film by the well-known Russian film director who directed silent films such as "Strike (1925), and "Battleship Potemkin(1925) was based on the true story of Pavlik Morozov and thought to have been destroyed before its completion?
Sentence (from "Sergei Eisenstein"): He is noted in particular for his silent films "Strike" (1925), "Battleship Potemkin" (1925) and "" (1928), as well as the historical epics "Alexander Nevsky" (1938) and "Ivan the Terrible" (1944, 1958).
Relevant evidence: Yes