Long before the US and Israel attacked Iran, the Islamic Republic had devised its own weapon: holding the world’s main oil lifeline hostage to offset its foes’ military superiority, three regional sources familiar with Iranian planning said. For decades, Iran has signalled that if pushed into a confrontation, it would restrict tanker traffic in the Strait of Hormuz, the chokepoint where its adversaries are most exposed because disruptions there reverberate instantly through global energy...