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

Donald Trump has frequently spoken about the need for NATO allies to increase the amount they spend on defense.

President also plans to ask for "financial contribution" for maintenance of remaining troops, European diplomatic source said.

Europe should welcome rather than rebuff U.S. President Donald Trump's call for other NATO members to ramp up their military spending, Polish Prime Minister Donald Tusk said on Wednesday, stressing the importance of security to the continent.

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 for comment via email.

President Donald Trump has called for NATO members to significantly increase their spending on defense, suggesting a target of 5% of gross domestic product to go toward military spending. What To Know: Trump reiterated the 5% of GDP spending goal on Monday following his inauguration,

NATO boss Mark Rutte said Trump "has been right many times" and played it cool when grilled by members of the European Parliament on the president-elect's Greenland plans.

NATO estimated that 23 of its members met its current goal of spending 2% of GDP in 2024. “The 2% is not enough,” Rutte told a European Parliament committee session in Brussels. New military capability targets emerging from NATO’s internal planning ...

NATO Secretary General Mark Rutte said members have to boost spending. If not Europeans should "get out your Russian language courses or go to New Zealand," he said. NATO Secretary General Mark Rutte told members of the security alliance to boost defense spending or prepare to learn Russian.

NATO Secretary General Mark Rutte has stressed in his conversation with European Parliament members that he believes defence spending at a level of 2% is insufficient to ensure the safety of allies in the next four to five years.

Slovakia’s pro-Russian prime minister has raised the prospect of his country leaving the European Union and Nato, arguing that world events could consign them to the “history books”.

European countries have ramped up defense budgets since Russia's all-out invasion of Ukraine in 2022. And many leaders have said the increased spending must continue to counter the growing military threat from Moscow.