[4] Same year they joined the Experimental Workshop led by Nikolai Khodataev, Yuri Merkulov and Zenon Komissarenko to work on the cutout feature film China in Flames made in support of the Chinese national liberation movement.
[4] In 1936 the Brumberg sisters along with many other Moscow-based animators moved to the newly founded Soyuzmultfilm where they focused on creating Disney-styled shorts based on the popular children's fairy tales such as Little Red Riding Hood and The Magic Swan Geese.
During that time they directed The Tale of Tsar Saltan which was released in 1943 shortly after they returned to Moscow, and by 1945 they finished The Lost Letter which ran over 40 minutes, making it the earliest surviving traditionally animated Soviet feature film.
[4] During the next 15 years they produced a number of other Eclair-based features and short films such as The Night Before Christmas (1951) and The Island of Mistakes (1955), often teaming with their close friend, a comedy actor Mikhail Yanshin who not only lent his appearance, movements and voice, but also worked as a screenwriter and consulting director, providing them with the talents of the Moscow Art Theatre.
[4][5] With It Was I Who Drew the Little Man (1960), a full-length remake of Fedya Zaitcev, the Brumberg sisters joined the new wave of animation brought by the Khrushchev Thaw.
Big Troubles (1961) was stylized as primitivistic child's drawings, while the characters in Three Fat Men (1963) based on the popular Soviet fairy tale of the same name consisted of simple geometric shapes.