The US is the only country who has triggered
Article 5 (9/11). The US then refused what was offered, choosing to go it alone. Although NATO eventually took over in Afghanistan.
"Security" is just another Trumpism (aka a lie to most sensible people).
Here is what it is really about:
Tech moguls in the front row of his [Trump's] inauguration, like Mark Zuckerberg and Jeff Bezos, are also investors in a start-up aiming to mine western Greenland for materials crucial to the artificial intelligence boom.
a Reuters investigation reported that a group of wealthy U.S. investors and political actors had explored the idea of building a privately governed “freedom city” in Greenland.