From Wikipedia:
The Night Before Christmas (Russian: Ночь пе́ред Рождество́м, Noch pered Rozhdestvom) is a 1951 Soviet traditionally-animated feature film directed by the Brumberg sisters and produced by the Soyuzmultfilm studio in Moscow. The film is based on Nikolai Gogol’s story The Night Before Christmas.
The animation features heavy use of rotoscoping, known as “Éclair” in the Soviet Union, and is an example of the Socialist-Realist period in Russian animation.Read More »