ABOARD AIR FORCE ONE – US President Donald Trump said a decision on US troop levels in Europe would hinge on how allies addressed his concerns over Greenland and the Iran war, comments likely to intensify NATO members’ worries about over his commitment to collective security.

“I haven’t made that final determination,” Trump told reporters aboard Air Force One as he returned to Washington from the NATO summit in Ankara, Turkey. 

“A lot’s going to depend on Greenland,” Trump added, floating the prospect that he would get “a very good deal” on the island. “A lot’s dependent on Iran.”

The president’s comments follow a contentious NATO summit in which he assailed fellow partners over defence spending, their reluctance to help the US in its war on Iran, and the status of Greenland, a territory of NATO member Denmark.

Trump has long coveted Greenland, casting it as critical to US national security, a stance that has angered allies.

His obsession with the island peaked earlier in 2026 during the World Economic Forum in Davos, when he had European allies worried Trump might try to take Greenland by force.

Trump revisited the issue on July 8, saying he was “very unhappy” with the alliance over the matter.

Allies put on a full-court press in Ankara, seeking to convince the US that they are reliable partners and announcing billions in defence deals.

Ahead of the gathering, foreign capitals worried Trump would scale back US security commitme...