As President Trump looks to fix the issues that irk him the most, the issue of NATO defense spending — one of his perennial bugbears — is returning to the fore.

Europe’s military heavyweights have already said that meeting President Donald Trump’s potential challenge to spend up to 5% of their economic output on security would be challenging

Russia on Thursday rejected the idea of NATO countries sending peacekeeping troops to Ukraine in the event of a ceasefire in the war with Russia, saying such a move would threaten to cause an "uncontrollable escalation".

Congress passed legislation that a president cannot unilaterally withdraw from NATO, setting up a major legal fight if Trump tries to pull the US out.

NATO has been ramping up its forces along its eastern flank with Russia, Belarus, and Ukraine, deploying thousands of troops and equipment to deter Moscow from expanding its war into the territory of any of the organization’s 32 member countries.

Anders Vistisen, a Danish member of the European Parliament, has told U.S. President Donald Trump to "f*** off" after Trump again expressed interest in purchasing the island of Greenland. Newsweek has contacted the White House and Vistisen for comment via email.

In December, the United Kingdom joined the Comprehensive Security Integration and Prosperity Agreement. More countries will follow. C-SIPA, as the still-small grouping is known, could soon become the NATO of the Middle East.

New US president is serious about tariffs and angry with the EU. Keir Starmer must use UK's freedoms outside the bloc to escape trade wars and thrive

NATO Secretary General Mark Rutte on Thursday urged the United States to keep supplying Ukraine with weapons to fight Russia's invasion and said he was sure Europe was ready to pay the bill. Speaking at the World Economic Forum in Davos,