The United States plans to establish two new military sites in Greenland under a new security agreement with Denmark and Greenland, according to three people familiar with the matter. The deal is expected to bring back a Cold War-era US base in southern Greenland and create another military site on the island’s east coast.

The planned sites are Narsarsuaq and Mestersvig, according to two of the sources. Narsarsuaq has seen its population fall to only a few dozen people since the US shut its Bluie West One military base there in the 1950s. Mestersvig is currently used by Denmark’s Sirius Dog Sled Patrol, a special forces unit responsible for patrolling parts of Greenland.

Denmark, Greenland and the US are expected to sign the agreement at the United Nations General Assembly in New York at 10:30 a.m. ET (1430 GMT) on Tuesday. The full text of the deal has not been released. The three people familiar with the agreement said its details could change before the signing.

The governments of Denmark and Greenland did not immediately respond to Reuters’ requests for comment. A White House spokesperson also declined to comment on the specific details of the agreement. The spokesperson repeated an earlier statement that its signing on Tuesday would "secure and defend ‌the security ⁠of Greenland and the United States."

Denmark has said the agreement will place Arctic security within the framework of the North Atlantic Treaty Organisation (NATO). This would move the issue beyond a security arrangement handled only by the US and Denmark.

The agreement comes after months of pressure from US President Donald Trump, who has repeatedly said he wants the United States to control Greenland. Trump has also at times refused to rule out using military or economic force to acquire the semi-autonomous Danish territory.

Greenland’s residents have strongly rejected the idea, according to polling cited in the report. Trump’s comments reached a peak in January and led to a diplomatic crisis within NATO. Denmark and Greenland then began talks with Washington in an effort to ease tensions.

Greenland has long held strategic importance for the US. During the Cold War, the United States operated 17 military installations across the island and stationed more than 10,000 personnel there. Today, the US maintains only the Pituffik Space Base, which has around 150 American military personnel.

The new agreement would expand the US military presence in Greenland while giving NATO a larger role in Arctic security. The proposed sites would also add to Denmark’s existing military and patrol infrastructure across the strategically important territory.