To The Stars By Hard Ways (1981) might be the most beloved Soviet scifi. The hero ship is a sanitation vessel!

Road to the Stars (1957) is about trying to rescue stranded cosmonauts.

Ikarie XB-1 (1963) a Czechoslovak film about Earth's first mission to seek first contact. It pioneers Trek tropes about a spacious, luxurious interstellar vessel with gender equality, and some allege Roddenberry may have seen it during his navy days and taken notes.