UBB.Developers Forums General Discussion Chit Chat Spam

I've started getting spam with stuff like :

модель поощрения

and

Ответственность за на...

and

Подготовка критериев ...

in the title and who knows what for content.

Is there a simple way to block at least foreign language spam? I've tried adding some of the letters to my mail rules, but the mail program doesn't recognize it and instead thinks I'm adding a '?' to be blocked.