U.S. President Donald Trump has wrapped his participation in the annual NATO summit, a gathering far chummier than the tense meetings of his first term.

President Donald Trump laughed off jokingly being called "daddy" by NATO General Secretary Mark Rutte. Rutte made the remark in reference to Trump's intervention in the Israel-Iran conflict, where he angrily pulled both sides back from violating the ceasefire he had just brokered.

Following years of criticizing NATO as a "rip-off," President Trump now endorses the alliance as member countries agree to double their defense spending targets.

President Donald Trump's critics scoffed at his idea for NATO allies to pay more for their defense. Now, a new deal is in place to achieve that goal.

Tensions between the U.S. and its NATO allies have cooled off since most of the alliance's member states agreed to increase their defense spending from 2 percent of GDP to 5 percent by 2035, which many Trump supporters say is proof that his hard-charging negotiating tactics, even among friends, produces results.