When President Recep Tayyip Erdogan reopens Istanbul’s Hagia Sophia for prayers next week, it will be the crowning symbol of his mission to reassert Turkey’s role as a Muslim power on the global stage. Yet Turkey’s rarely seemed more alone.From conflicts in Syria and Libya to strikes in Iraq, Nato’s second-largest army is at work day and night with armed drones, warplanes and tanks. Turkish ships sail the Mediterranean, quarrelling over gas resources with European Union members Greece and…