Danish Prime Minister Mette Frederiksen called Thursday for increased Arctic defense collaboration with the United States during a visit to Greenland, and firmly dismissed the US desire to annex the semi-autonomous Danish territory.

The United States and Denmark offered drastically different perspectives regarding a meeting on the sidelines of the NATO conference happening in Brussels. Secretary of State Marco Rubio met with Danish Foreign Minister Lars Løkke Rasmussen in Brussels on Thursday amid the NATO foreign ministers’ meeting.

Danish Prime Minister Mette Frederiksen is in Greenland for a three-day trip aimed at building trust and cooperation with Greenlandic officials at a time when the Trump administration is seeking control of the vast Arctic territory.