TIME spoke to legal experts about whether Trump could legally pull the U.S. out of NATO and the wider implications.

In recent years, profound tectonic shifts have been unfolding on the global political stage. After the collapse of the socialist system and the

Donald Trump’s attempt to strongarm Denmark and Europe into accepting the annexation of Greenland is a disgraceful betrayal of the Western alliance, a foolish misunderstanding of the American national interest,

U.S. NATO ambassador Matthew Whitaker defends American focus on Greenland amid European backlash, calling Arctic security crucial for continental defense.

The Trump administration has repeatedly said the U.S. should be in control of Greenland, which is part of Denmark and NATO.

President Donald Trump says that NATO should help the U.S. acquire Greenland and anything less than having the island in U.S. hands is unacceptable. His comments in a social media post Wednesday came hours before Vice President JD Vance was to host Danish and Greenlandic officials for talks.