Use of present perfect tense in news articles

When to use present perfect tense has always been confusing for me.
I know that it carries a sense of continuity from the past, but many times in news articles, I come across sentences with present perfect tense that do not have anything to do with continuity.

For example,
"President Trump has promised legal action in the coming days as he refused to …"
Here, it does not sound right to say that Trump had been continuously promising legal action.

Another example:
"While the mission is “indeed challenging,” McDowell said China has already landed twice on the moon…."

For this one, China landing on the moon twice was events completed in the past. They are not landing continuously.. So why use present perfect tense here rather than just go "China already landed twice on the moon"?

What nuance does present perfect tense carry that I’m not getting here?
I would greatly appreciate any help!
Thank you in advance! 🙂