Brent and WTI futures rose sharply on July 7 after Iranian forces fired missiles at commercial vessels in the Strait of Hormuz, hitting at least three tankers including a Qatari LNG carrier and a Saudi crude tanker Reuters. By July 8, at least four oil and gas tankers had turned back from attempting the transit rather than risk the passage Reuters. This reversed a supply-recovery trade that had been pressing prices lower just 24 hours earlier CNBC.

The whipsaw is remarkable given where sentiment stood on July 6. The New York Times reported that a recovery in Gulf oil flows, combined with an OPEC Plus pledge to increase production, was pushing energy prices down NYT. That narrative rested on a US-Iran agreement, brokered with Qatar as mediator, to reopen the strait and extend a ceasefire, reported July 1 AP. Within a week, that agreement had been overtaken by events on the water.

Washington's policy shifted in parallel with military escalation. The US revoked the general license that had permitted sales of Iranian crude, reinstated oil sanctions on Iran, and launched new military strikes against Iranian targets Reuters. Iran's joint military command had issued a warning on July 2 — days before the attacks — insisting that all tankers use designated approved routes or face consequences AP. Iran's leadership has separately signaled no talks will resume unless US strikes halt Reuters.

About one-fifth of global seaborne oil transits Hormuz on a normal day. The World Bank estimated a 3.7 million barrel-per-day deficit for Q2 2026 tied to reduced production during earlier disruptions — a baseline for how tight the physical market already was before this week's attacks World Bank.

The insurance side has been repricing this risk for weeks. Lloyd's launched a new marine war risk consortium on June 19 specifically to support Hormuz shipping Lloyd's. With shipping risk for the strait now rated severe Reuters, war risk premiums on hull and cargo policies are moving faster than the oil futures curve itself — and they now carry significant weight in the landed cost of crude.

Here is the pivot. Even if a reopening deal materializes, the AP reported in mid-June that full oil flow would take weeks or months to restore, owing to rerouting delays, insurance clearance, and crew safety assessments before vessels resume transit at scale AP. This lag matters for trading the oil futures curve: even if a ceasefire holds, spot barrels stay scarce well after diplomatic headlines turn positive. Any dip in near-term prices should not be mistaken for resolved risk.

The market has repriced tail risk twice in one week — down on July 6's flow-recovery narrative, then sharply back up on July 7's attacks. That kind of swing tends to compress liquidity in the options market, which hedgers often rely on when volatility spikes. Implied volatility on Brent options is now a cleaner gauge of market stress than spot price alone, since spot is hostage to headline risk on an hour-by-hour basis. Traders running physical cargo hedges should track tanker position data (AIS) as closely as the newswires; four vessels turning back is itself a leading indicator of flow disruption ahead.

Sanctions enforcement adds another complication. With the general license revoked and sanctions reinstated, buyers of Iranian barrels face renewed compliance risk just as physical Gulf supply tightens from the attacks — a combination that pushes demand toward non-Iranian Gulf grades at exactly the moment those grades face the highest transit risk in years.