One big question was left unanswered at NATO's biggest summit of the year, and only America's delegation could answer it.But the U.S. did not discuss with its allies any plans to roll back the American troop presence in Europe,

The leaders reaffirmed their “ironclad commitment” to NATO’s collective defense clause, Article 5. In recent years, Trump had sowed seeds of doubt about whether the U.S. — NATO’s most powerful member — would come to the aid of any ally under attack.

In a press conference before heading back to Washington, Trump struck a conciliatory tone as he sought to harvest praise for the spending boost.