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."