Brent crude breaks above $91 a barrel as US refuses to extend Iran ceasefire and Trump raises prospect of Strait of Hormuz territorial claim
Brent crude, the international benchmark oil price, broke above $91 per barrel on 18 August 2026 after President Donald Trump confirmed he would not seek to extend the 60-day memorandum of understanding between the US and Iran following its expiration on Monday. The ceasefire had been presented as a key step toward a broader peace agreement. Trump reiterated his ambition to declare the Strait of Hormuz, the narrow waterway through which a significant portion of global oil supply passes, as US territory: "It's a great idea. I mean, we control it with the blockade, and I like the idea of declaring it a territory." He also threatened to "bomb" Oman if it "gets in the way" regarding US negotiations, after Oman reached a separate understanding with Iran regarding the transit route through the strait. Iran's foreign affairs spokesperson Esmail Baghaei said an "understanding has been reached regarding the map of the transit route", indicating continued Iranian engagement with Oman on Hormuz access. Rising oil prices feed directly into UK energy costs, inflation expectations, and the profitability calculations of energy-intensive industries. The City AM liveblog reported that UK equity markets were responding to the oil price move alongside separately reported data showing UK vacancies falling to a five-year low.
Why this matters
The Strait of Hormuz handles a substantial share of global oil and liquefied natural gas (LNG) exports, meaning any sustained escalation of tensions in the region has immediate pass-through effects on energy prices globally. Brent crude above $91 per barrel adds to inflationary pressure in the UK at a time when the Bank of England is calibrating the pace of rate reductions, and directly affects the cost base of energy-intensive manufacturers, airlines, and shipping companies. The prospect of the US seeking territorial control over an international waterway raises novel questions of public international law and shipping freedom-of-navigation that have no clear precedent in the modern era.
On the Ground
Rising energy prices and geopolitical risk generate advisory work across energy law, commodity trading, shipping and admiralty, and insurance practices. Energy lawyers will be reviewing force majeure and material adverse change clauses in long-term oil and gas supply contracts, and shipping lawyers will be advising on freedom-of-navigation risk. Insurance and reinsurance teams will be assessing war-risk and political-risk policy exposure. A trainee on an energy matter would assist with regulatory filing coordination, reviewing grid connection and supply contract documentation for price-adjustment provisions, and preparing summaries of applicable international legal frameworks governing maritime transit.
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“What legal frameworks govern freedom of navigation through international straits like the Strait of Hormuz, and how might a unilateral US territorial claim interact with those frameworks?”
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