A year of conflict in the Middle East has destroyed the foreign-policy approach of Iran’s supreme leader, Ayatollah Ali Khamenei. His strategy was always implausible, but its collapse has led Iran to the brink of its first international war since 1988.What I like to call the Khamenei Doctrine—those close to him have variously dubbed it “strategic patience” or, more to the point, “no peace, no war”—rests on a duality that has remained constant through Khamenei’s 35 years in power. Iran refuses any public dealings with Israel, clamoring instead for the…