Perspective: Trump's latest NATO broadside outrages America's allies amid lingering doubts over the alliance's future.

In a Truth Social post, President Trump suggested putting the world’s strongest military alliance “to the test” by invoking its mutual defense clause.

By Soren Jeppesen and Stine Jacobsen COPENHAGEN, Jan 23 (Reuters) - Denmark's Prime Minister Mette Frederiksen said on Friday she had agreed with NATO chief Mark Rutte that the alliance needs to boost security in the Arctic following weeks of turmoil over U.

The past year has been marked by ebbing and flowing of tensions in Europe and Canada over the U.S.'s commitment to NATO.

NATO chief Mark Rutte defends Trump's impact on European defense spending, saying allies wouldn't have reached 2% GDP targets without his pressure.

Business Insider spoke with Spanish pilots who are deployed to Lithuania to contribute to NATO air policing missions.

Trump has renewed his criticism of Nato, questioning whether the alliance would come to America’s defence and suggesting it should be “put to the test” by deploying forces to the US–Mexico border.

NATO chief Mark Rutte says U.S. versus Danish control of Greenland was not discussed in his talks with President Donald Trump, which led to an agreement on new Greenland "framework."