Iran Fires on Hormuz Shipping, Reversing Oil's Ceasefire Selloff

The Ship Attacks

The trigger was straightforward: three cargo ships were struck by projectiles off Iran's coast, with one hit directly in the Strait of Hormuz, according to the UK's Maritime Trade Operations. The IRGC followed up with a declaration that "not a litre of oil" would pass through the strait, the most explicit blockade statement yet.

This came on the same day U.S. intelligence confirmed Iran had begun laying dozens of mines in the strait's shipping lanes. The U.S. military destroyed 16 Iranian minelaying vessels in response, but Iran retains 80-90% of its small boat and minelayer fleet according to U.S. sources — meaning it can deploy hundreds more mines if it chooses. Mine clearance is a slow, methodical process, and even a few dozen mines in the strait could keep commercial shipping frozen for weeks.

Why Yesterday's Selloff Didn't Stick

On March 9-10, crude collapsed from $119 to the low $80s after Trump told CBS the Iran war was "very complete, pretty much" and signaled the conflict would end soon. Energy Secretary Chris Wright amplified the de-escalation narrative by posting — then deleting — a claim that the U.S. Navy had escorted an oil tanker through Hormuz. The White House denied it happened.

The market wanted to believe the off-ramp. Instead, it got ship attacks, mine deployments, and the IRGC doubling down on the blockade. Trump's own messaging fractured further on March 11 — he simultaneously said the war would end "very soon" and that attacks would continue "until the enemy is totally and decisively defeated." The contradiction pushed traders back toward pricing in a prolonged disruption. WTI rebounded to $86.57, up 3.74%, while Brent climbed to $91.65.

The IEA's Record Backstop

Running parallel to the escalation, the IEA unanimously approved a 400 million barrel release from member countries' strategic reserves — more than double the 182 million barrels released after Russia invaded Ukraine in 2022. Japan began releases immediately, the UK committed 13.5 million barrels, and South Korea pledged 22.46 million barrels.

The scale is significant but not decisive. 400 million barrels equals roughly four days of global oil production or 16 days of Gulf crude transit volume. The pace of daily releases matters more than the headline number for sustained price relief. Analysts at OilPrice.com warned that if the physical blockade persists, the reserve release buys time but doesn't solve the structural supply gap — roughly one-fifth of global seaborne crude remains cut off.

The net result: the IEA announcement pulled prices off their intraday highs but couldn't push them below where they opened. The war premium is back, and until ships actually transit Hormuz safely, it stays.

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