BRUSSELS (AP) — U.S. President Donald Trump’s threats to annex Greenland and slap tariffs on its backers pose a challenge to Europe’s security, principles and prosperity, a top EU official said on Wednesday.

BRUSSELS (AP) — European Union leaders are gathering for emergency talks on Thursday to chart a new course in transatlantic relations after a tumultuous two weeks dominated by U.S. President Donald Trump’s renewed threats to take control of Greenland.

The EU chief offered to deepen cooperation with the US in Arctic region and termed imposing additional tariffs a "mistake."

President Donald Trump threatened Saturday to impose new 10% tariffs on imports from several European countries. It could unravel months of progress made during trade negotiations settled after Trump’s trade war last year.

The signal comes a day before EU leaders meet to find ways to respond to President Donald Trump’s Greenland grab and tariff threats.

The surreal clamor over Greenland provoked by Trump has shadowed proceedings in Davos, heightening fears of an emerging rupture between the U.S. and Europe.

“The Board of Peace charter … raises a concern under the EU’s constitutional principles,” states the document written by the European External Action Service and dated 19 January. The EEAS notes that the proposed governance structure in Trump’s board charter departs from what was agreed by the United Nations (UN).

President Donald Trump has posted private text messages from the head of NATO and France's president to the U.S. President, shortly after Norway's leader confirmed a leaked exchange did show tense correspondence between the Republican and NATO leaders.

President Trump said on Jan. 21 that he would not use military force to take control of Greenland, offering some relief to residents who had feared such a move.