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"): Sergei Mikhailovich Eisenstein (Russian: Сергей Михайлович Эйзенштейн ; ] ; 22 January [O.S. 10 January] 1898 11 February 1948) was a Soviet film director and film theorist, a pioneer in the theory and practice of montage.
Relevant evidence: No