ANKARA, Turkey—U.S. President Donald Trump arrived in the Turkish capital, Ankara, on July 7 to join the two-day NATO leaders’ summit. Air Force One landed at Etimesgut Air Base just before 2 p.m. local time. This is the first visit to Turkey by a sitting U.S. president since President Barack Obama attended the G20 summit in Antalya in 2015. NATO’s 32 member countries and key partners are meeting on July 7 and 8 to review progress on defense spending commitments made at last year’s summit in The Hague. Turkish President Recep Tayyip Erdogan is hosting the summit at his presidential complex in Ankara. ...