Iran's effective blockage of the Strait, one of the world's most important shipping channels, has had a catastrophic impact on global supply chains and energy prices. Iran's new Supreme Leader Mojtaba Khameini has vowed to keep blocking the strait as a means of political and economic pressure against the US. About 20% of the world's oil usually passes through the strait. As the US and Israel's war with Iran enters its third week, a number of ships have been attacked as they attempt to navigate the narrow strait. Hitting out at Trump as "very reckless" in this "illegal and damaging war", Davey said Britain should not be at the beck and call of an American president "who does not seem to know what he is doing". In 2025, about 20 million barrels of oil passed through the Strait of Hormuz per day, according to estimates from the US Energy Information Administration (EIA) – that's nearly $600bn (£447bn) worth of energy trade per year.