Oil does not whisper in wartime. It leaps. The global benchmark Brent crude surged more than 6% to trade near $78 a barrel, after spiking as much as 13% intraday — its most violent move since the early shock of 2022. For a brief moment, prices pierced levels not seen since January 2025. The trigger was neither rumour nor rhetoric, but geography: the effective paralysis of the Strait of Hormuz.

One fifth of the world’s oil — and vast volumes of liquefied gas — pass through that narrow maritime artery off Iran’s coast. Now tanker traffic has largely halted, not by formal decree, but through self-preservation. Shipowners and traders have paused operations as Israeli-American strikes on Iranian targets escalated into open regional confrontation.

This is no longer proxy theatre. It is direct. Missiles struck across Iran. Tehran retaliated against Israel and against American-linked installations across the Gulf — Saudi Arabia, Qatar, the United Arab Emirates, Kuwait and Bahrain. Iran’s Supreme Leader, Ali Khamenei, was killed. President Donald Trump declared that US forces had sunk nine Iranian warships and vowed combat operations would continue “until objectives are achieved”. Energy markets, which had spent months pricing surplus, are now repricing disruption. Iran produces roughly 3.3 million barrels per day — around 3% of global output. Modest in isolation. Decisive in location. The Persian Gulf’s exports must transit Hormuz to reach China, India and Japan. Geography is destiny; in oil, it is leverage.

While Iranian authorities insisted the waterway remained technically open, they also confirmed attacks on tankers. Insurers have begun reassessing war-risk cover. Some major protection clubs are suspending it altogether. The Strait need not be formally closed to be functionally unusable. Markets understand this nuance. OPEC+ convened an early meeting and agreed to increase quotas by 206,000 barrels per day next month — a gesture of reassurance. Yet spare capacity is irrelevant if exports cannot flow. Production without passage is inventory.

Analysts at Citigroup Inc now see Brent between $80 and $90 in the coming week under their base case. Morgan Stanley has lifted its second-quarter forecast to $80 from $62.50. Wood Mackenzie warns that if Hormuz remains obstructed, prices could exceed $100. JPMorgan Chase & Co analysts note that after roughly 25 days of closure, storage constraints could force Middle Eastern producers to curtail output entirely. Oil markets had been preoccupied with oversupply narratives. OPEC+ increases. Non-OPEC resilience. Slowing Chinese demand. That framework now feels quaint.

This is a geopolitical repricing, not a cyclical one. The implications stretch beyond traders’ screens. Sustained higher energy prices will feed global inflation precisely as central banks, including the Federal Reserve System, attempt to stabilise price dynamics without crushing growth. Rate-cut debates will collide with imported cost shocks. Policy becomes reactive; volatility becomes embedded. Trump has indicated the offensive may continue for four to five weeks, though he has left open the possibility of lifting sanctions under a “pragmatic” new Iranian leadership. Markets, however, do not trade on political hypotheticals. They trade on shipping lanes.

The first minutes of trading told their own story: more than 40,000 Brent lots changed hands almost immediately in Asia. West Texas Intermediate rose above $71. Liquidity thinned; spreads widened. Gold rallied. Freight rates began to climb. Oil’s worst fears are not theoretical when tankers turn back. In finance, there are moments when supply curves bend gently. And there are moments when chokepoints redraw them violently. Hormuz is not merely a strait; it is a fulcrum. When it wavers, the global energy system tilts. The market had grown comfortable with the assumption that escalation would always stop short of an interruption. That assumption has now been tested. And oil, once again, has remembered its political nature.