Trump has expressed his desire to acquire Greenland since as long ago as 2019 and, during his second term, has issued threats to seize the semiautonomous territory from Denmark, a NATO ally.
Denmark and the US already have a long-standing security agreement that has allowed the US to deploy forces in Greenland, and it was not immediately clear how this deal was different from that.
Several media outlets have reported that the United States wants to open three new military bases in southern Greenland, in addition to the Pituffik base it already has in the north of the territory.
Denmark and Greenland -- an autonomous territory controlled by Copenhagen -- both hailed the deal and said they would sign it on the sidelines of the UN General Assembly in New York next week.
US President Donald Trump insisted earlier this year that Washington needed to control Greenland for national security reasons, though he ultimately ruled out annexing it by force.
Trump argued that Denmark has not invested enough in Greenland and said the island's strategic importance is growing as China and Russia expand their presence in the Arctic.
