President Donald Trump and British Prime Minister Theresa May await a photo opportunity at a NATO summit meeting in Brussels on Thursday. Dan Kitwood/Getty Images hide caption

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German Chancellor Angela Merkel and former President of the United States Barack Obama arrive for a discussion on democracy in Berlin Thursday. Steffi Loos/Getty Images hide caption

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U.S. Defense Secretary James Mattis (in black dress shoes) walks with U.S. Army leaders across a NATO logo last month as he arrives at Resolute Support headquarters in Kabul, Afghanistan. Jonathan Ernst /AP hide caption

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Jonathan Ernst /AP

The old town area of Budva, a seaside town in Montenegro. Tuul and Bruno Morandi/Getty Images hide caption

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Alleged Plot, Coming Trial In Montenegro Reads Like a Thriller

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President Trump reaches to shake hands with NATO Secretary General Jens Stoltenberg during a news conference in the East Room of the White House on Wednesday. Evan Vucci/AP hide caption

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Trump, In A 180-Degree Switch, Says NATO 'No Longer Obsolete'

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President Trump looks on as German Chancellor Angela Merkel addresses the media at a joint news conference Friday at the White House. Chip Somodevilla/Getty Images hide caption

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Supporters of Turkey's President Recep Tayyip Erdogan walk to the Dutch consulate in Istanbul on Saturday. Turkey and the Netherlands escalated their spat on Saturday as the Dutch withdrew landing permission for the Turkish foreign minister's plane. Emrah Gurel/AP hide caption

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Speaking at NATO headquarters Monday, Vice President Pence addressed the ousting of Michael Flynn and attempted to assuage fears that the United States might not uphold its commitments to NATO under President Trump. Emmanuel Dunand/AFP/Getty Images hide caption

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An Afghan girl on the outskirts of Kabul, Afghanistan, in October 2016. The U.N. mission in Afghanistan says the number of children killed or wounded increased 24 percent last year. Rahmat Gul/AP hide caption

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Rahmat Gul/AP

Donald Trump interviewed on Larry King Live on Oct, 7, 1999. Trump said he had formed an exploratory committee to help him determine whether he could win the White House as a Reform Party candidate. Marty Lederhandler/AP hide caption

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Marty Lederhandler/AP

Donald Trump's Been Saying The Same Thing For 30 Years

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A copy of the German newspaper Bild Zeitung featuring an exclusive interview with U.S. President-elect Donald Trump lies on a table in a train on Monday in Berlin. Sean Gallup/Getty Images hide caption

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President Obama and Russian President Vladimir Putin pose for the media before a bilateral meeting at United Nations headquarters on Sept. 28, 2015. Andrew Harnik/AP hide caption

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Andrew Harnik/AP

Thanks To Russia, 2016 Isn't Really Going To End For Obama And Trump

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An Estonian soldier takes aim during a training exercise at Tapa Army Base, Estonia, on Nov. 17. U.S. troops were also taking part in the training, about 70 miles from the border with Russia. NATO countries are stepping up their presence in Eastern Europe at a time of rising tensions with Russia. Lucian Kim/NPR hide caption

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Lucian Kim/NPR

Near The Russian Border, U.S. And NATO Beef Up Their Presence

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Turkish President Recep Tayyip Erdogan and NATO Secretary General Jens Stoltenberg (left) met in Istanbul Monday. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

Stark Choice For NATO's Turkish Officers: Arrests At Home, Limbo In Europe

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U.S. military planes drop paratroopers during a multi-national jump that includes soldiers from the U.S., Britain and Poland on June 7, near Torum, Poland. U.S. President-elect Donald Trump has questioned the value of the NATO alliances, raising worries among many European countries. Alik Keplicz/AP hide caption

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Alik Keplicz/AP

What Does Trump's Victory Mean For NATO?

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