While I have no issue with the Russian audience, I agree that their presence can be pretty... overwhelming in chat. Instead of having to ignore everyone you don't want to hear (some of which might actually speak perfectly fluent English and choose to do so), I suggest an option in the interface to hide all chat messages with Cyrillic character in them.
It doesn't really discriminate, since it's a "per player" choice - And you'd most likely do it, since you can't read Cyrillic characters, much less understand Russian words.
On an entirely different subject - Y'all really need to change the chat font. Accented letters and Cyrillics appear in bold. It looks silly. So silly.