The European Union can help provide security for Greenland, should Denmark request it, the European Commissioner for Defence and Space said, warning that a U.S. military takeover of the island would be the end of NATO.

The senator's comments come after President Donald Trump said the U.S. would "do something on Greenland, whether they like it or not."

German Chancellor Friedrich Merz said Monday he assumes that the United States will participate in a stronger NATO presence to improve security in Greenland.

Greenland will not accept a US takeover under “any circumstance” and demanded NATO ensure its defense Monday amid President Trump’s desire to acquire the autonomous territory of Denmark. “The United States has once again reiterated its desire to take over Greenland.

Trump’s threat to annex an autonomous part of Denmark has plunged NATO into an unprecedented situation: An alliance based on collective defense now faces the prospect that one member might attack another.

Britain is discussing with NATO allies how to enhance Arctic security against Russia and China. Transport Secretary Heidi Alexander said Sunday that these talks are routine and not a response to U.S.

German Foreign Minister Johann Wadephul said on Monday that NATO allies had to work together for security, and said Greenland and Denmark should decide the future of the island, which U.S. President Donald Trump says should belong to the United States.

The response comes amid concerns over Russia's continued military build-up in the region and its close ties to China.

Germany is planning to set up a joint Nato operation in the Arctic in an effort to dissuade Donald Trump from annexing Greenland.

Top Trump aide Stephen Miller says it's the "formal position" of the White House that Denmark's territory of Greenland "should be part of the U.S."

It’s not for peaceful purposes,” U,S, Air Force Gen. Alexus Grynkewich said. “They’re not studying the seals and the polar bears."