If you loved Operation Y and Other Shurik's Adventures, try The Secret of the Third Planet
A bridge between a film you've already seen and one most people haven't. The Secret of the Third Planet has roughly 4.3× fewer votes than Operation Y and Other Shurik's Adventures — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Operation Y and Other Shurik's Adventures

The Secret of the Third Planet
What they share
Theyboth carry the foreign gem, playful mood tags. If that's the register that drew you to Operation Y and Other Shurik's Adventures, the second film will land in a comparable space — through a different lens.
What The Secret of the Third Planet is
Observant explorers of the 22nd century set off collecting cosmic fauna for Moscow Zoo, unaware their cargo of a chatty bird carries the key to a shadowy plot. Along the way they dodge a villain aiming to silence the legendary Two Captains but can’t outrun a squawking sidekick who knows too much. A feathered MacGuffin saves the day, though the story’s niche ambitions never quite fill the big screen.