For several weeks, Google News has been tinkering with their RSS feeds. We have a thread at Google News Help where Googler, Inbal, said it should be fixed in a week or so, well, it has been a week.
We have a new Google News Help thread with an example of foreign language searches via RSS not working. Let me show you.
A Google News search for [фармацевтический] which means pharmaceutical returns several results on the web version but when I flip to the RSS version, I get no results. Here is a picture of the RSS version using Safari's RSS reader:
I am not sure when this will be fixed, but Inbal from Google said, "Thanks for taking the time to report this issue. Our engineers are on top of it."
Forum discussion at Google News Help.