The trilateral summit in Tehran between the presidents of Turkey, Iran and Russia was one of the most unusual parades of international diplomacy yet. It was televised live. Let’s remember the scenes: All who watched it saw how Turkish President Recep Tayyip Erdogan blundered and how Russian President Vladimir Putin ridiculed him. Then it was a rare — if not unique — case of international diplomacy where a trilateral partnership considered detrimental to the interests of the West displayed signs of failure on a burning international issue.What has had the West — the transatlantic security system — worried for some time is NATO-member Turkey’s partnership...