Greenland's defense is now a major NATO focus after US President Donald Trump threatened to take the Arctic island by force. Troops from France, Germany, Norway, Sweden, and others started arriving in Greenland, an autonomous territory of Denmark, on Thursday. Denmark also announced plans to boost its military presence there. The move follows a tough Washington meeting on Wednesday involving Greenland's and Denmark's foreign ministers, Vivian Motzfeldt and Lars Løkke Rasmussen, and US leaders JD Vance and Marco Rubio. The talks aimed to improve relations but fell short. Trump repeated his claim that the US "needs" Greenland for national security. He said Denmark "could not be relied on to protect the island" and promised "something will work out." Danish Prime Minister Mette Frederiksen called the meeting "not an easy meeting" and confirmed a working group to discuss Arctic security improvements. She warned, "the American ambition to take over Greenland is intact," calling the situation "serious." NATO agrees that "a strengthened presence in the Arctic is crucial for European and North American security." Denmark said it has "invested significantly in new Arctic capabilities" and allies are joining exercises "in and around" Greenland. "The defence and protection of Greenland is a common concern for the entire NATO alliance," Frederiksen said. French President Emmanuel Macron announced French troops were "already en route". About 15 French mountain infantry soldiers were in Nuuk for exercises. Germany plans to send a 13-person reconnaissance team. Danish Defence Minister Troels Lund Poulsen aims to create "a more permanent military presence" with larger Danish troop contributions. NATO forces will rotate through Greenland. Rasmussen said after the US talks that disagreement remains: "it is clear that the president has this wish of conquering over Greenland." Trump said, "We really need it," warning Russia and China might move in if the US does not. "There's not a thing Denmark can do about it, but we can do everything about it."