Iran’s threats to ships passing through the strait give the government in Tehran leverage over global energy markets, pushing up prices and creating fears of shortages of oil, natural gas, cooking fuel and fertilizer. Around a fifth of the world’s oil normally passes through the channel. Since the beginning of the war in late February, several ships have been struck by missiles or drones in the strait, at least two seafarers have died, and insurance costs have soared. There have been reports that Iran has mined the waterway.