WASHINGTON — President Donald Trump said Friday that the United States and Denmark had reached an agreement giving Washington what he described as “permanent control over security” in Greenland, potentially paving the way for a larger U.S. military presence there. The White House did not publish the agreement, and the Danish Embassy did not immediately comment. Without the text, it was not possible to determine how the new arrangement differs from a 1951 U.S.-Denmark defense agreement that already allows the United States to station troops and expand military facilities in Greenland. Trump said in a post on Truth Social that the agreement would prevent any U.S. adversary from maintaining a military presence in Greenland. He also said it gives the United States broad authority to take steps needed to protect Greenland and American security. Greenland is a self-governing territory of the Kingdom of Denmark. Copenhagen retains responsibility for the territory’s foreign affairs, while Greenlanders have their own government and have repeatedly faced pressure over the island’s strategic importance, natural resources and future political status. The announcement comes after months of negotiations involving the United States, Denmark and Greenland. Trump has repeatedly argued that Greenland is vital to U.S. national security and has expressed interest in taking control of the territory. His rhetoric has alarmed Greenlanders, prompted protests and drawn criticism from European leaders and some Republican lawmakers. The United States already maintains a military installation at Pituffik Space Base, formerly Thule Air Base, and has a wider but relatively limited defense footprint on the island. U.S. warships can use a deepwater port, while radar systems relay information to the Pentagon. The size of the American presence has shifted over time in response to changing security conditions. The Pentagon also moved Greenland from the area overseen by U.S. European Command to Northern Command, which is responsible for North American security. That change gave Greenland a more direct place in U.S. defense planning, despite the territory’s constitutional ties to Denmark. The lack of a public agreement leaves major questions about its scope, including whether it changes existing rules governing bases, troops and military operations. It also remains uncertain whether the announcement signals a resolution of the tensions created by Trump’s demands or marks a new phase in the dispute over Greenland’s sovereignty and security.