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.

Nearly all members of the transatlantic alliance agreeing to spend 5% of their gross domestic product on defense — a priority of President Trump's for years.

U.S. President Donald Trump on Wednesday wrapped up participation in the annual NATO summit, a gathering notable this year for an atmosphere that was far chummier toward Trump than the tension-filled meetings of his first term.