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,

Member states largely agreed to a U.S. demand to boost defense spending to 5% of gross domestic product. Trump, who once derided the alliance as a "rip-off," said his view had changed, while a budding bromance blossomed between him and Rutte, who compared the U.S. president to a stern "daddy" managing his geopolitical underlings.

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.