The debate about whether the Joint Comprehensive Plan of Action with Iran regarding its nuclear program stabilized the Middle East’s strategic framework had barely begun when the region’s geopolitical framework collapsed. Russia’s unilateral military action in Syria is the latest symptom of the disintegration of the American role in stabilizing the Middle East order that emerged from the Arab-Israeli war of 1973.

In the aftermath of that conflict, Egypt abandoned its military ties with the Soviet Union and joined an American-backed...