AP Photo

Turkey’s situation amounts to more than just a passing concern to the US and its allies. Ankara hosts many of the rebels fighting Iran-backed forces in Syria. Turkey is also home to a Nato radar station the US says is key to protecting against future Iranian missiles, including nuclear ones. The days of 2010, when Recep Tayyip Erdogan, Turkey’s prime minister, triumphantly held aloft the hand of Iran’s President Mahmoud Ahmadi-Nejad are long gone. Tension between Ankara and Tehran is high.