In fact - I'd say it's horror movie.
It's dark. Not only suroundings are dark, but people too.
Dark city, with old, rotten buildings,
Dark people with no vision of future - young people going to rotten disco and drinking, older people just drinking at home ( on day off).
Mother of captain Zhurov totally disconnected from worl having only her chair, vodka and TV with Russian propaganda and concerts ( World in TV shows was much better, than reality).
The kidnapper cares about his mother, he's not too bad, but he can't find a woman ( because of his low self worth and impotence), he wants love and to be loved.
The movie is sad, because there is no future.