The EU and Nato have taken a vow of silence over Greenland after Denmark requested its key allies refrain from reacting to Donald Trump’s threats to seize the Arctic island.

The European Union is "not negotiating" on Greenland, EU's foreign policy chief Kaja Kallas said on Monday, amid claims by U.S. President Donald Trump that the United States needs to control Greenland for security purposes.

European Union foreign policy chief Kaja Kallas said Monday that Europe is “not negotiating” with the United States over control of Greenland, as President Trump continues to insist that acquiring the self-governing territory of Denmark is necessary for American national security.

The secretary of State said purchasing the Danish territory is important to the country’s national interests in the Arctic.

Secretary of State Marco Rubio said on Thursday that President Donald Trump's offer to “buy” Greenland is “not a joke”, adding that acquiring the semi-autonomous Danish territory was in the US “national interest”.

US President Donald Trump is serious about seeking to buy Greenland, Secretary of State Marco Rubio said on Thursday, after Denmark was rattled by his threats to take over the autonomous Danish territory.