When Prime Minister Sa’d al-Hariri was summoned on 3 November to Riyadh and allegedly compelled to resign as Prime Minister of Lebanon amidst Saudi Crown Prince Muhammad bin Salman’s “anti-corruption” crackdown, something was clearly awry. Mr Hariri cited a foiled assassination plot and Iranian-fuelled “sedition, devastation and ruin” in the Arab world  perplexingly less than a year after forming a coalition government with Hizbollah.

Following an...