BRUSSELS (Reuters) -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.

The Danish PM's tour of three capitals betrayed the nervousness felt in Denmark over Trump's repeated comments.

NATO Secretary-General Mark Rutte and Danish PM Mette Frederiksen have agreed on the importance of strengthening defenses in the Arctic. This comes amidst U.S. President Donald Trump's interest in acquiring Greenland,

Frederiksen will meet German Chancellor Olaf Scholz in Berlin, French President Emmanuel Macron in Paris and NATO Secretary-General Mark Rutte in Brussels, during a whirlwind day of international diplomacy as Trump threatens to upend the polar security architecture.

Denmark's prime minister plans stops in Berlin, Paris and Brussels on tour of European capitals as Copenhagen moves to strengthen its presence in Greenland.

NATO Secretary-General Mark Rutte and Danish Prime Minister Mette Frederiksen emphasized the need for stronger Arctic defenses during their meeting on Tuesday, a source told Reuters. Both leaders agreed that all

Denmark is increasing military spending in the North Atlantic amid President Donald Trump’s bid to have Greenland sold or ceded to the United States.

Frederiksen didn't directly mention Trump's threat in comments at a meeting with German Chancellor Olaf Scholz, but said that “we are facing a more uncertain reality, a reality that calls for an even more united Europe and for more cooperation.