NATO chief: Alliance faces biggest challenge since WWII


              Turkish President Recep Tayyip Erdogan 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)
            
              French President Emmanuel Macron, 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)
            
              French President Emmanuel Macron, center right, and Turkey's President Recep Tayyip Erdogan walk together after a bilateral meeting during the NATO summit Wednesday, June 29, 2022 in Madrid. North Atlantic Treaty Organization heads of state will meet for a NATO summit in Madrid from Tuesday through Thursday. (AP Photo/Christophe Ena, Pool)
            
              NATO Secretary General Jens Stoltenberg, 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)
            
              Slovakian President Zuzana Caputova 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)