Officials summoned the American ambassador to express its displeasure after the Trump Administration was said be ratcheting up surveillance.

The prospect of American annexation has reinvigorated ties between the island and Copenhagen, though aspirations for independence persist.

Denmark's foreign minister says he will summon the US ambassador to address a report that Washington's spy agencies have been told to focus on Greenland amid Donald Trump's threats to take over the island. "It worries me greatly because we do not spy on friends," Lars Løkke Rasmussen said, responding to the report in The Wall Street Journal.