US Ends Iran Ceasefire With Strait of Hormuz Strike, Oil Chokepoint Risk Returns

The Quick Take

• The US military struck Iranian rocket launchers on Larak Island in the Strait of Hormuz to prevent mine-laying in the critical oil shipping lane
• The action marks the first US strike against Iran after weeks of ceasefire, signaling a return to active hostilities in the world's key energy chokepoint
• The Strait of Hormuz carries a substantial share of global crude oil trade, making military escalation there an immediate threat to energy supply chains worldwide

The United States military ended a weeks-long ceasefire with Iran by striking Larak Island in the Strait of Hormuz, targeting rocket launchers and disrupting what the US military assessed as preparations to lay naval mines in the waterway. The Strait of Hormuz is the world's most critical oil transit chokepoint, through which a significant portion of global crude oil and liquefied natural gas shipments from Gulf producers passes. Any credible threat to shipping through the strait—whether from mines, military blockades, or attacks on tankers—creates immediate premium pricing in global energy markets and triggers reappraisal of supply chain security across energy-importing economies.

The resumption of US-Iran hostilities in the Strait of Hormuz will send oil prices higher, compounding the inflationary pressure already affecting mortgage rates, consumer spending, and central bank rate expectations globally. Tanker operators and maritime insurance underwriters will immediately price escalating Strait risk: war risk insurance premiums for vessels transiting the region are likely to spike, adding to shipping cost inflation for every cargo passing through the channel. Oil majors with Gulf production—BP, Shell, and TotalEnergies—carry both operational exposure and benefit from higher crude realizations. For the UK, where this cluster is tagged, BP's significant Gulf operations mean any escalation directly affects one of London's most heavily weighted FTSE 100 stocks.

Track US Central Command communications and satellite imagery of Strait of Hormuz shipping traffic for real-time assessment of whether the escalation is contained or expands to an active naval blockade. Brent crude's price response in Asia-Pacific trading will confirm whether energy markets have already priced the risk or are adding further war premium. Watch whether Iran retaliates with additional mine-laying, tanker seizures, or Houthi-linked attacks on Gulf infrastructure—the escalatory trigger for a broader energy supply crisis. The macro variable is whether OPEC+ members, particularly Saudi Arabia, signal emergency production adjustments to offset any Strait disruption, which would put a ceiling on crude prices.

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