Operation Arctic Endurance

Operation Arctic Endurance is a 2026 Danish-led military exercise and presence operation in Greenland, an autonomous territory of the Kingdom of Denmark, in response to the Greenland crisis. According to the Danish Defence, the operation will last throughout 2026, while the Danish Government announced that the deployment might remain in Greenland for one to two years.

In response to United States president Donald Trump's continuous threats of invading or annexing Greenland, a number of European NATO states began deploying military planning staff to the island, concentrated in the capital, Nuuk. Major-General Søren Andersen, commander of the Joint Arctic Command (JACMD; Arktisk Kommando), stated the exercise is focused on countering potential Russian activity, not defending against U.S. military threats; however, outside analysts described the deployment as a tripwire force actually directed at the U.S. to make any invasion politically costly.

By 19 January, Denmark sent 200 soldiers to Greenland to reinforce JACMD permanent personnel, later announcing that a "substantial contribution" of its armed forces would follow; by 20 January, more soldiers arrived, together with Major General Peter Harling Boysen, Chief of the Royal Danish Army, who said he is ready to defend Greenland. Danish troops also brought a contingency stock of live ammunition in case of a "worst case scenario" of combat against invading U.S. forces.

On 21 January, in a speech at the World Economic Forum in Davos, Switzerland, Trump officially changed his position from possibly using military force to obtain Greenland, to ruling out the use of military force; this is consistent with Trump's position on his proposed annexation of Canada.