News of a framework deal came as Trump backed off tariff threats and ruled out taking Greenland by force, bringing a degree of respite in what was brewing to be the biggest rupture in transatlantic ties in decades.

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But the details of any agreement were unclear and Denmark insisted its sovereignty over the island was not up for discussion. EU foreign policy chief Kaja Kallas said relations between the bloc and the U.S. had "taken a big blow" in the past week, as EU leaders met for an emergency summit.

Greenland's Prime Minister Jens-Frederik Nielsen welcomed Trump's latest comments but said he was still in the dark on many aspects.

"I don't know what there is in the agreement, or the deal, about my country," he told reporters in the capital Nuuk.

"We are ready to discuss a lot of things and we are ready to negotiate a better partnership and so on. But sovereignty is a red line," he added, when asked about reports that Trump was seeking control of areas around U.S. military bases in Greenland as part of a wider deal.