Denmark and Greenland are stepping up their military presence on the island and allied reinforcements are expected to follow with Sweden confirming a deployment of military officers to the Arctic at Denmark’s request, according to a statement by prime minister Ulf Kristersson.

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

Yesterday, after Greenland’s prime minister, Jens-Frederik Nielsen, vowed to cast his lot with Denmark over the United States, Trump said that he didn’t “know anything about” Nielsen but that such a choice would be a “big problem for him.”

Denmark warns the US against invading Greenland, saying any military move would “mean war” as tensions rise over the island’s future and Nato’s role.

As NATO prepares for war games around Greenland, Russia is highlighting the Trump administration's disagreement with its closest allies over the island.

The Arctic is no longer a distant frontier. Danish military aircraft have landed in Greenland, unloading troops as Copenhagen prepares for a potential standoff with the United States. What began as diplomatic friction has moved onto ice and airstrips,

Denmark has said Washington’s ambition to take control of Greenland remains unchanged, even as European Nato countries began deploying military person.