How do I filter .ru out of a Google search?

I routinely use Google to look for things online that mention me. Recently it's gotten much harder because of the increasing number of web pages that are constructed by taking chunks of text from elsewhere likely to get clicked on, mashing them together, and then showing you either a fake update of adobe flash player or a fake exchange about downloading some book for free, generally the book that one chunk of text referred to. Both are presumably ways of getting something onto your computer that you don't want there.It would be nice if someone could provide a way of filtering out all of those, but that might be hard. But a large fraction, probably a majority, are .ru URL's, and it should be possible to filter those out of a search. Can someone more familiar with the more advanced features of Google tell me how to do it?