Driven by its need to keep stable relations with Russia, Turkey will resist pressure to join NATO’s isolation campaign against Moscow in response to the Ukraine invasion. Turkey’s historically strained relations with Russia are facing a new test as Russian military forces invade Ukraine and Ankara’s Western allies line up to isolate and punish Moscow. But Turkey is reliant on Russian tourists, energy and good diplomatic relations. It’s also still interested in diversifying defense ties away from NATO. This has left the country hesitant to embrace the West’s sanctions strategy, with Ankara so far avoiding direct cuts to Russian economic ties. On Feb. 27, Turkey said it would enact provisions of the 1936 Montreaux Treaty that allow it to block its key straits to countries engaged in battle. Ankara, however, also stuck to the stipulations of the treaty that allow Russian warships to pass to return to base, which --...