I learned something relevant today. Boris Dyozhkin and Gennadiy Filippov created a cartoon with a very similar plot in 1937 at Soyuzmultfilm in Moscow (for Dyozhkin, the studio's star animator, it was the first time he directed): Привет героям! (Greetings to the Heroes!). Dyozhkin had heard about the success of the Arctic expedition, and burned with the desire to commemorate it. He called on Filippov, who found a composer, and they locked themselves in their room with bread and water and finished animating the movie in just 7 days! (as related by Dyozhkin's wife in her interview with Sergey Kapkov, which I read in his 2025 book "The Legends of Soyuzmultfilm Studio", p. 55) It was not in the studio plan, but the management had no choice but to accept the film, which was well liked by viewers. However, it apparently has not survived at all, not even a still image from it!
So, I was thinking: this Ukrainian cartoon from Odessa was likely inspired by the earlier one made in Moscow. Maybe that could even be one of the reasons it wasn't allowed to be finished? Did some higher-up say "we already have something similar"?