By Gram Slattery, Jonathan Landay and Humeyra Pamuk WASHINGTON, Jan 20 (Reuters) - The United States plans to reduce the number of personnel it has stationed within several key NATO command centers, a move that could intensify concerns in Europe about Washington's commitment to the alliance,

The Trump administration has repeatedly said the U.S. should be in control of Greenland, which is part of Denmark and NATO.

President Trump on Thursday said the United States should have put NATO to the “test” when it comes to the U.S. southern border by invoking Article 5, in which the multilateral organization states an armed attack against one member is considered an attack against all,

Denmark’s Prime Minister Mette Frederiksen has issued one of her strongest public warnings yet. This comes after US President Donald Trump renewed his controversial claims over Greenland. Frederiksen’s message was clear and serious.

President Trump’s announcement appeared to draw the United States back from the possibility of military and economic conflict with American allies over Greenland.

The president's goal of annexing the Danish territory has already created cracks in the mutual trust that holds NATO together.

White House Deputy Chief of Staff Stephen Miller said that the United States could take control of Greenland without facing military resistance, dismissing concerns about the implications for the NATO alliance.

"Europe’s relevance will depend on its readiness to live in a world without the Atlantic alliance," writes Ivan Krastev