During the cold war, USSR film studios didn't much care about intellectual property rights in the west. Only rarely did any Western film show in the Soviet Union. Instead, an equally good homespun movie industry produced an entire alternate universe of film.
Some of this is just starting to get released, But in a very capitalist kind of censorship -- some of it may never be seen here. You won't be able to see anything but a bootleg of the Russian Winnie Pooh, because Disney's ownership of the film rights prevents distribution of this clever Mosfilm version.