NATO chief: Alliance faces biggest challenge since WWII


              NATO Secretary General Jens Stoltenberg, Estonia's Prime Minister Kaja Kallas and Spanish Prime Minister Pedro Sanchez, from left, pose for the media at the official welcome for the NATO summit in Madrid, Spain, on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Bernat Armangue)
            
              Denmark's Prime Minister Mette Frederiksen, right, is welcomed by Spanish Prime Minister Pedro Sanchez at the official arrivals for the NATO summit in Madrid, Spain, on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Bernat Armangue)
            U.S. President Joe Biden, right, speaks with Netherland's Prime Minister Mark Rutte, second right, and Turkish President Recep Tayyip Erdogan, left, during a round table meeting at a NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state and government will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Susan Walsh, Pool) 
              NATO leaders pose for a group photo following the official welcome for the NATO summit in Madrid, Spain, on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Bernat Armangue)
            
              Denmark's Prime Minister Mette Frederiksen, center right, arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              British Prime Minister Boris Johnson arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              France's President Emmanuel Macron, right, and Turkey's President Recep Tayyip Erdogan shake hands during a bilateral meeting as part of the NATO summit in Madrid, Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (Bertrand Guay, Pool via AP)
            
              Italian Prime Minister Mario Draghi, center, arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              German Chancellor Olaf Scholz speaks with the media as he arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              NATO Secretary General Jens Stoltenberg speaks as he arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              Supreme Allied Commander Transformation General Philippe Lavigne, left, gestures as he arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              Iceland's Prime Minister Katrin Jakobsdottir arrives for the NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)
            
              NATO Secretary General Jens Stoltenberg arrives for a NATO summit in Madrid, Spain on Wednesday, June 29, 2022. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Paul White)