Exactly five years ago, the US-backed, Saudi-led Arab coalition carried out its first air strikes on Yemen in an effort to reinstate the disgraced, exiled President Abdrabbuh Mansur Hadi. He is a statesman in name only who I have argued previously has neither power, authority nor legitimacy. The strikes targeted the Houthi movement, which is supported by the Yemeni armed forces, and the war, claimed the Saudis, was supposed to be over in a matter of weeks.