WASHINGTON (AP) — A top Danish official said Wednesday that a “fundamental disagreement” over Greenland remains with President Donald Trump after holding highly anticipated White House talks with Vice President JD Vance and Secretary of State Marco Rubio.

The two sides, however, agreed to create a working group to discuss ways to work through differences as Trump continues to call for a U.S. takeover of the semiautonomous territory of NATO ally Denmark.

“The group, in our view, should focus on how to address the American security concerns, while at the same time respecting the red lines of the Kingdom of Denmark,” Danish Foreign Minister Lars Lokke Rasmussen told reporters after joining Greenland’s foreign minister, Vivian Motzfeldt, for the talks. He added that it remains “clear that the president has this wish of conquering over Greenland.”

Trump is trying to make the case that NATO should help the U.S. acquire the world’s largest island and says anything less than it being under American control is unacceptable.

Denmark, meanwhile, announced plans to boost the country’s military presence in the Arctic and North Atlantic as Trump tries to justify his calls for a U.S. takeover of the vast territory by repeatedly claiming that China and Russia have their designs on Greenland, which holds vast untapped reserves of critical minerals.

The president, who did not take part in Wednesday’s meeting, told reporters he remained committed to acquiring the territory.

“We need Greenland for national security,” Trump said. “We’ll see how it all works out. I think something will work out.”

Trump named Louisiana Gov. Jeff Landry as a special envoy to Greenland last month. Landry did not attend Wednesday’s meeting, but was scheduled to travel to Washington on Thursday and Friday for meetings that include the topic of Greenland, his spokesperson said.

Before the meeting, Trump took to social media to make the case that “NATO should be leading the way” for the U.S. to acquire the territory. NATO Secretary General Mark Rutte has sought to keep an arms-length away from the dispute between the most important power and the other members of the 32-country alliance unnerved by the aggressive tack Trump has taken toward Denmark.

Both Lokke Rasmussen and Motzfeldt offered measured hope that the talks were beginning a conversation that would lead to Trump dropping his demand and create a path for tighter cooperation with the U.S.

“We have shown where our limits are and from there, I think that it will be very good to look forward,” Motzfeldt said.

In Copenhagen, Danish Defense Minister Troels Lund Poulsen announced a stepped-up military presence in the Arctic “in close cooperation with our allies,” a necessity in a security environment in which “no one can predict what will happen tomorrow.”

Other NATO allies were arriving in Greenland along with Danish personnel, Poulsen said, declining to give details.

Some of the emerging plans appeared modest. Germany said it would send 13 personnel this week to Greenland “to explore the framework for potential military contributions” on the island. Sweden announced it was sending an unspecified number of personnel to Greenland for military exercises. And Norway was sending two military personnel to map out further cooperation with allies, the country’s defense minister, Tore O. Sandvik, told newspaper VG.

NATO is also looking at how members can collectively bolster the alliance’s presence in the Arctic, said a NATO official who was not authorized to comment publicly and spoke on condition of anonymity.