It is official that they deprecated google news feed in Dec 2017. Until they permanently shut down the news feed within the next few month, there is a temporary fix though. Try not to use the first item in the feed.
<title>This RSS feed URL is deprecated</title>
<category>Google News RSS feed URL deprecation</category>
<pubDate>Fri, 12 Jan 2018 13:15:32 GMT</pubDate>
<description>This RSS feed URL is deprecated, please update. New URLs can be found in the footers at https://news.google.com/news</description>