Denmark’s prime minister has told the U.S. during a visit to Greenland that “you cannot annex another country,” even with the argument that international security is at stake.

The U.S. and Denmark offered drastically different perspectives regarding a meeting on the sidelines of the NATO conference in Brussels.

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