NATO leaders convening Wednesday in the Netherlands were prepared to offer President Donald Trump a major win by boosting their defense spending targets. But comments he made while flying to the conference were raising fresh concerns about his commitment to the alliance’s core principal of collective defense.

Ahead of a key NATO summit, President Donald Trump once again raised questions about America’s commitment to defend its allies should they come under attack from outside

Past NATO summits have focused almost entirely on the war in Ukraine, now in its fourth year - but Kyiv’s bid to join the alliance has been stalled since the election of U.S. President Donald Trump. The U.