New Delhi, July 9 -- NATO's summit in Turkey on Wednesday had threatened to go off the rails even before U.S. President Donald Trump and his counterparts sat down to work. But the leaders renewed their vow to defend each other should any of them come under attack.

It came despite a fresh storm of old Trump criticism toward U.S. allies that seemed to put his commitment in doubt. In the end, Trump told reporters, "There was a lot of love in that room. A lot of unity."

"We've had a tremendous time and I think a great success," Trump said later at a news conference.

In a declaration, the leaders said their pledge to Article 5 of NATO's treaty is "ironclad." They said that "an attack on one is an attack on all."

NATO Secretary-General Mark...