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.

A group of European countries, led by Britain and Germany, is discussing plans to boost their military presence in Greenland to show U.S. President Donald Trump that the continent is serious about Arctic security,

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."

Britain's Transport secretary characterized the security talks as "business as usual" rather than a direct response to Trump.

The US is considering military action to seize Greenland, in a move that could cause divisions within the NATO alliance.

Veteran diplomat tells CBS News Denmark "ready to cooperate" on Greenland, and he expects U.S. to abandon "anachronistic approach of colonialism" post-Trump.

Poland's prime minister is worried about the strain the United States' threat to take over Greenland is putting on NATO, he said on Friday, adding that as a loyal ally Warsaw should be honest with Washington about its concerns.

Speaking during a traditional New Year press conference, Meloni said the use of military action in Greenland would not be in anyone’s interest and would have serious consequences for NATO.

LONDON, Jan 11 () - Britain said on Sunday discussions with other NATO members on deterring Russian activity in the Arctic were "business as usual", after media reports the ​UK was in talks with its European allies about deploying a military force to ‌Greenland.