Greenland rejects US takeover 'under any circumstance': govt

Trump has repeatedly threatened to bring the island under US control, arguing that the Danish autonomous territory is crucial for national security.

"The United States has once again reiterated its desire to take over Greenland. This is something that the governing coalition in Greenland cannot accept under any circumstance," the Greenlandic government said in a statement.

On Sunday, Trump warned that if the United States didn't take Greenland, "Russia or China will, and I'm not letting that happen".

The US leader said he would be open to making a deal with the Danish self-governing island, "but one way or the other, we're going to have Greenland."

Last week, France, Germany, Italy, Poland, Spain and the United Kingdom issued a joint statement with Denmark to show their backing for Copenhagen and Greenland against Trump.

"On the basis of the very positive declaration from the six NATO member states regarding Greenland, the Government of Greenland will intensify efforts to ensure that the defence of Greenland is carried out within NATO," Monday's statement said.

"Greenland will always be part of the Western defence alliance," the government added.

Denmark and other European allies have voiced shock at Trump's threats over the strategic island, which has been home to a US military base since World War II.

A Danish colony until 1953, Greenland gained home rule 26 years later and is contemplating eventually loosening its ties with Denmark. Polls show that Greenland's people strongly oppose a US takeover.