More than a decade had passed since Ahmed al-Sharaa squeezed into the narrow lift that went up to his parents’ 10th-floor apartment. The Soviet-style block hadn’t changed much since he last ...

It is CERAWeek, the sprawling Texas energy conference, and Sultan al-Jaber, who runs the Abu Dhabi National Oil Company (Adnoc), one of the world’s largest oil companies, is in high demand.