Even small things like Chewbacca which is derived from a Russian word for dog - Sobaka came from the same movie Planet of Storms where the dog helps the space explorer. The Terminator 2 final scene where the Arnold goes down in molten lava is taken from Planet of Storm similar scene... etc..
Maybe by our modern standards. But the movie was so revolutionary at that time that it was edited, voice-overed and all the mentions of the Soviet actors removed, fake American names were added in credits. And I think some additional scenes were shot in US (source https://en.wikipedia.org/wiki/Planeta_Bur).
