200 words is not a lot of content. In general, I'd say 200 words is on the thin side and wouldn't usually answer searchers questions. Most of the time searchers would be be happier with your longer articles.
200 words could be fine for some news though. It might tell people what they need to know about a current event. Having those short news blurbs could be good for users in the right context.
Are those short news blurbs going to hurt the SEO of your longer more in depth content? Probably not. It is likely that Google will send more traffic to your longer pages and mostly ignore your shorter news articles. However, there is always a chance that those short news blurbs get marked as low quality by Google. If that happens, it have a negative impact on your site as a whole.
To be safe you could prevent Googlebot from crawling all your short new blurbs by putting a rule like
Disallow: /news/ in your robots.txt file. That would prevent all of the news stories in the
/news/ folder from getting crawled. Google would be very unlikely to send significant traffic to any of them or view your site as low quality because of them.
If you really want them to get traffic initially when they are fresh, you could instead put a
<meta name="robots" content="noindex"> tag in the head of the page after a month. That would prevent Google from seeing a large number of them on your site while still allowing the fresh ones to appear in Google News.