I don't know Russian or Ukrainian, so I can't check that or provide an answer. But even If I understood the languages, I could still not tell you why certain posts are not removed. Maybe the local or global mods don't share your opinion that they are off topic. If you feel that some posts should be removed, report them and include which rules are being broken in the reports. Have you done that and what is the status of those reports? Good, bad, unhandled?