Oil markets registered a sharp move higher in early Asian trading after U.S. President Donald Trump instructed the navy to begin blockading the Strait of Hormuz, a key chokepoint for global oil flows. By 19:11 ET (23:11 GMT), Brent futures had risen 8% to $102.93 a barrel.
U.S. Central Command said the military would begin enforcing a blockade of all maritime traffic entering and leaving Iranian ports from 10:00 ET (14:00 GMT) on Monday. The announcement followed a presidential order to seal the Strait of Hormuz.
The decision came after ceasefire negotiations between Washington and Tehran failed to produce an agreement during talks held over the weekend in Pakistan. Key sticking points in those discussions included Iran’s nuclear programme, the reopening of the Strait of Hormuz, and Tehran’s support for proxy groups, among them Lebanon’s Hezbollah. The U.S. delegation was led by Vice President JD Vance, who left Pakistan early Sunday after 21 hours of talks that did not reach a consensus.
Market participants interpreted the combination of continued U.S.-Iran hostilities and a comprehensive blockade as a signal of prolonged disruption to global oil supplies. The article of record indicates Iran had effectively blocked the Strait of Hormuz since the start of the conflict in late-February, a move that removed roughly 20% of global oil supplies from normal flows.
Separately, Iran stated it had no plans to resume nuclear talks with the United States. Meanwhile, a U.S. newspaper reported that Middle Eastern governments were attempting to broker additional ceasefire negotiations between Washington and Tehran in the coming days.
This episode illustrates how shifts in military and diplomatic dynamics can translate immediately into commodity prices. The timing of the announced enforcement - specified in hours - and the public accounting of the failed talks were rapidly incorporated into prices, driving Brent back above the $100-per-barrel threshold.
Traders and downstream market participants will be watching subsequent diplomatic efforts and any operational details on how the blockade is enforced, as these will determine the duration and severity of supply interruptions.