I’m pretty sure this was listed as A Piece of Paradise in Air China’s in-flight entertainment guide, even though the subtitles call it The Heavenly Corner. The Russian title is Pайский Yголок. According to Google Translate, the two words correspond to the words ‘paradise’ and ‘corner’.
My college friend who studied Russian expressed extreme surprise when I said a Russian movie I’d watched had a happy ending, but it does!
The basic idea here is that the female protagonist has everything she ever dreamed of (a successful husband, two lovely kids, and a comfortable life) but is unhappy in her marriage. She gradually realizes that her husband has become a real lowlife. He gets his comeuppance and she gets a new guy. Ta-da! That’s it, really. Still, it’s interesting because of the setting and language. I mean, how often do you get to watch a Russian movie? Not often, right?
For more information, you could follow this link, but it won’t help you much unless you or your web browser can read Russian. I’m just not finding anything in English on this movie at all.