I don't know whether it's a problem with all ISBN or only Russian editions, but whenever I or my friends try to import a book via ISBN it usually has no or wrong cover, missing description and genres, and it often has wrong page info. And that's if it works. Which it often doesn't.

For the moment I've switched to manual import, but it takes a lot of time. I suspect that whatever ISBN archive you pull the info from doesn't fully cover non-English books, but it's just a guess.

I understand that it's probably not an easy issue to fix, but it really takes away the enjoyment of using the SG, at least for me, so I hope you will manage to resolve it soon.