AP Photo

Just two years ago, as part of its “zero problems with neighbors” policy, Turkey removed visa requirements with several countries, including Syria, its neighbor to the south. Thousands of middle class Syrians flooded the 500-mile border, visiting the malls of Gaziantep or scouting for business partners amongst Turkey’s vibrant merchant class. It was a time of great enthusiasm about Turkey across the Middle East, the heyday of the Mavi Marmara affair, when the Eastern-looking Prime Minister Recep Tayyip Erdogan appeared to be standing up to Israel, even the United States. Arabs embraced Turkish soap operas and named their baby boys Tayyip. Erdogan was best friend to everyone, and on especially good terms with Syrian President Bashar al-Assad. The two were photographed...