Lebanon’s fragile stability was plunged into uncertainty on 4 November when Prime Minister S’ad al-Hariri announced his resignation from Riyadh, citing fears for his life and pointing the finger at Iran and the Iranian backed militia group Hizbollah.

President Michel Aoun will now be tasked to appoint Mr Hariri’s successor but that process is far from simple in a country that is far too often bogged down in sectarian squabbling at the highest level. Mr Aoun was appointed...