Denmark's Prime Minister Mette Frederiksen said on Tuesday following a meeting with French President Manuel Macron that political leaders in Europe and beyond have given full backing to maintain respects for international borders.

The Prime Minister of Denmark, Mette Frederiksen, is appealing to her European allies for help in dealing with US President Donald Trump's demands to appropriate Greenland, Bloomberg reports. Frederiksen is touring major capitals after a $2 billion investment in the defense of the Arctic island,

Interest in buying Greenland has "popped up from time to time in American politics," Tom Høyem, Denmark's former minister to Greenland, told ABC News in an interview.

NATO Secretary-General Mark Rutte and Danish Prime Minister Mette Frederiksen agreed at a meeting on Tuesday that allies need to focus on strengthening defences in the Arctic, a source familiar with the talks told Reuters.

Denmark said on Monday it would spend 14.6 billion Danish kroner ($2.05 billion) boosting its military capabilities in the Arctic – a decision that comes amid continuing furor following US President Donald Trump’s renewed interest in controlling Greenland,

The move comes after President Donald Trump said he wants to acquire Greenland, an autonomous Danish territory.