Dutch semiconductor equipment maker ASML became just the third European company to his a valuation of over $500 billion on Thursday.

"This is incredibly embarrassing," Raymond Johansen, a Norwegian lawmaker for the center-left Labour Party, said in a Facebook post.

The Kremlin called Trump's threats to take over Greenland "extraordinary" on Friday, adding that Moscow will continue to closely monitor the situation.

Danish Foreign Minister Lars Lokke Rasmussen described the White House talks as "frank but constructive."

The joint NATO exercise comes shortly after tense talks between officials representing the U.S., Denmark and Greenland.