Danish Prime Minister Mette Frederiksen has warned that the U.S takeover of Greenland would mean an end to the alliance.

Top Trump aide Stephen Miller says it's the "formal position" of the White House that Denmark's territory of Greenland "should be part of the U.S."

Danish Prime Minister Mette Frederiksen says an American takeover of Greenland would amount to the end of the NATO military alliance.

The response comes amid concerns over Russia's continued military build-up in the region and its close ties to China.

European leaders have sounded the alarm over Donald Trump’s ambitions to take over Greenland, but the U.S. president may instead be thinking of his legacy. If that’s the case, many analysts, diplomats and politicians believe not only will European diplomacy fail,

President Donald Trump pledges U.S. will "always be there for NATO" while questioning alliance's commitment amid tensions over Greenland push.

Trump continued: "RUSSIA AND CHINA HAVE ZERO FEAR OF NATO WITHOUT THE UNITED STATES, AND I DOUBT NATO WOULD BE THERE FOR US IF WE REALLY NEEDED THEM. EVERYONE IS LUCKY THAT I REBUILT OUR MILITARY IN MY FIRST TERM, AND CONTINUE TO DO SO. We will always be there for NATO, even if they won’t be there for us."

Poland's prime minister is worried about the strain the United States' threat to take over Greenland is putting on NATO, he said on Friday, adding that as a loyal ally Warsaw should be honest with Washington about its concerns.