The latest maritime attack, minimal tanker traffic and fading hopes for a diplomatic settlement pushed Brent crude above $91, intensifying inflation and supply-chain risks for Asia.
MARKET INSIDER — A commercial vessel was struck by an unidentified projectile while leaving the Strait of Hormuz on Tuesday, underscoring the continuing danger to shipping as a 60-day U.S.-Iran ceasefire and negotiating period expired without a final agreement.
The attack damaged the vessel’s engine room and caused an unspecified crew casualty, according to the United Kingdom Maritime Trade Operations agency. The remaining crew were receiving assistance from the Omani Coast Guard. No environmental damage was reported, and authorities had not publicly identified the attacker.
The incident, combined with deteriorating diplomacy, pushed Brent crude above $91 a barrel and added to pressure on Asian equities, currencies and government bonds.
Key Highlights
- A vessel was struck by an unknown projectile while transiting outbound through the Strait of Hormuz. The engine room was damaged, and UKMTO reported a crew casualty without specifying whether the person was injured or killed
- The remaining crew received assistance from the Omani Coast Guard. The 60-day U.S.-Iran ceasefire and negotiation period expired without a permanent agreement.
- Brent crude rose to approximately $91.49 a barrel, while West Texas Intermediate reached about $85.25. Only six vessels crossed Hormuz on Monday, compared with 130 to 140 daily crossings before the war.
- No very large crude carriers or LNG tankers were observed among Monday’s crossings. Japan’s 10-year government bond yield reached 2.945%, its highest level since 1996.
- Disruption at both Hormuz and Bab el-Mandeb is raising insurance, fuel and freight costs across Asian supply chains.
Latest attack demonstrates continuing maritime danger
UKMTO said the vessel was hit by an unknown projectile while transiting outbound through the Strait of Hormuz.
The projectile damaged the engine room and caused a crew casualty. UKMTO did not publicly identify the vessel, provide further information about the casualty or attribute responsibility for the attack in its initial report.
That distinction is important. Although commercial ships have repeatedly been attacked during the conflict, available evidence does not establish who carried out Tuesday’s strike.
The remaining crew were being assisted by the Omani Coast Guard, and no environmental impact had been reported. Authorities were investigating the incident. Reuters report on the UKMTO alert
The attack confirms that navigating Hormuz remains dangerous even when limited commercial traffic is permitted. A partial reopening has little economic value if shipowners, crews and insurers do not believe vessels can pass safely.
U.S.-Iran negotiating period ends without a final agreement
The incident occurred as the 60-day framework agreed in June reached its deadline without producing a permanent settlement.
The arrangement was intended to create time for negotiations over Iran’s nuclear program, U.S. sanctions and the reopening of the Strait of Hormuz. It also contemplated restoring shipping traffic toward normal levels.
That recovery did not occur.
President Donald Trump ruled out extending the arrangement, while Iran said it could adopt a more offensive military posture if diplomacy failed. The two sides remain divided over sanctions, Iranian assets, nuclear restrictions and control of maritime traffic.
The expiration of the framework does not necessarily mean that full-scale fighting will resume immediately. Back-channel negotiations and mediation could continue, including discussions involving Oman.
However, the absence of an extension removes one of the few formal mechanisms restraining further escalation. It also makes it harder for shipping companies to judge whether any improvement in security will last long enough to justify returning vessels to the region.
Hormuz traffic remains a fraction of normal levels
Preliminary Kpler data showed six ships crossed Hormuz on Monday—three entering the Gulf and three leaving.
That represented a slight improvement from two crossings on Sunday and three on Saturday. It was still below the recent 10-day average of 11 crossings and drastically lower than the 130 to 140 daily vessel movements recorded before the war.
No very large crude carriers or liquefied-natural-gas tankers were observed among Monday’s crossings. Some ships may have passed with their transponders switched off and would therefore not appear in the data, according to Reuters shipping-flow report
The figures show why describing Hormuz as “open” or “closed” can be misleading.
The waterway is physically passable, and a small number of vessels continue to transit. Operationally, however, it remains severely impaired because of security threats, insurance constraints and shipowners’ reluctance to expose crews and cargoes to attack.
Before the conflict, Hormuz carried approximately one-fifth of global petroleum-liquids consumption and was also a major route for LNG exports. Most of those energy flows were destined for Asian buyers.
Why oil has not returned to its wartime peak
Brent rose by approximately 62 cents to $91.49 a barrel on Tuesday, while U.S. West Texas Intermediate gained about 75 cents to $85.25. Prices advanced as hopes for a diplomatic agreement faded and supply risks increased, according to Reuters oil-market report
Those prices are economically significant, but they remain below the levels above $120 reached during the most severe phase of the conflict earlier in the year.
Several factors have prevented an even larger increase.
Saudi Arabia and the United Arab Emirates possess pipelines capable of moving crude to terminals outside Hormuz. The U.S. Energy Information Administration estimates that their principal bypass systems have combined capacity of approximately 4.7 million barrels a day. That is substantial, although far less than the total energy volume that normally moves through the strait, according to U.S. Energy Information Administration
Saudi Aramco has also offered some Asian refiners crude delivered outside Hormuz through ship-to-ship transfers near Fujairah. Other cargoes have been routed through the Red Sea port of Yanbu and Egypt’s Sidi Kerir terminal.
Meanwhile, refiners are seeking alternative suppliers. Pakistan’s largest refiner, Cnergyico, has expanded purchases of U.S. crude after the conflict exposed the country’s dependence on Gulf shipments, Reuters reported.
Strategic inventories, weaker demand responses and the reorganization of trade routes have also helped prevent an immediate shortage.
These adaptations explain why oil has not surged uncontrollably. They do not mean the disruption is economically painless.
A manageable shock could become a prolonged one
The ability of producers and refiners to work around Hormuz creates a paradox.
If the global economy can withstand a partial closure without oil rising far above $100, Washington may feel less pressure to make concessions simply to restore shipping. Iran, meanwhile, retains an incentive to use maritime disruption as leverage because Hormuz remains one of its most powerful instruments of economic pressure.
That combination could prolong the confrontation.
The most likely market risk may therefore be neither an immediate resolution nor a complete shutdown. It may be a partially functioning waterway marked by intermittent attacks, restricted tanker traffic and persistent uncertainty.
Such an outcome would keep oil’s geopolitical premium elevated while forcing refiners, shipowners and importers to operate under expensive emergency arrangements.
A dramatic one-day oil shock is visible and can prompt a rapid policy response. A prolonged period of Brent trading around $90 to $100 may be less spectacular but more damaging over time because it gradually raises transportation costs, consumer prices and corporate working-capital requirements.
Oil above $90 complicates monetary policy
Expensive energy creates simultaneous inflation and growth problems.
Higher oil prices feed directly into gasoline, diesel, aviation fuel and electricity costs. They then spread indirectly through freight, agriculture, chemicals, plastics, manufacturing and consumer goods.
At the same time, households must allocate more income to fuel and utilities, leaving less money for discretionary spending. Companies unable to pass higher costs to customers face pressure on margins.
Central banks consequently confront an unfavorable choice. Raising interest rates can limit the risk that an energy shock becomes embedded in wages and inflation expectations, but tighter policy can further weaken demand. Cutting rates may support growth but could increase currency and inflation pressure.
Bond markets are already reflecting these concerns.
Japan’s benchmark 10-year government bond yield climbed to 2.945% on Tuesday, its highest level since September 1996. Rising oil prices added to expectations that the Bank of Japan may need to tighten policy further, citied by Reuters
The U.S. 10-year Treasury yield traded around 4.72%, while the 30-year yield approached 5.32%. Although several economic and fiscal factors are influencing bond markets, persistent energy inflation reduces the scope for central banks to provide monetary support.
Asian markets face the greatest immediate exposure
Asia receives most of the oil and LNG shipped through Hormuz, making the region particularly sensitive to disruption.
Japan, South Korea, India and many Southeast Asian economies rely heavily on imported energy. Higher crude prices can weaken trade balances, pressure currencies and increase domestic inflation.
Asian equities moved lower on Tuesday as investors weighed the combination of rising oil prices and higher bond yields. Japan’s Nikkei fell approximately 1.6%, while the broader MSCI Asia-Pacific index declined about 0.3%, according to Reuters global-markets report
India’s Nifty 50 fell 0.27%, while the Sensex declined 0.40%. As the world’s third-largest oil importer, India is particularly exposed through inflation, its current-account balance and the rupee. Foreign investors sold a net ₹25.35 billion, or approximately $265 million, of Indian equities in the preceding session, Reuters reported.
For Vietnam, the principal channels are fuel costs, shipping expenses, exchange-rate pressure and foreign capital flows. Airlines, logistics providers, fishing companies, plastics manufacturers and businesses dependent on imported materials are among the sectors most vulnerable to a prolonged energy shock.
Oil producers and some energy-service companies may benefit from higher prices, but those gains could eventually be offset if expensive energy weakens global demand.
Bab el-Mandeb creates a second chokepoint risk
Hormuz is not the only maritime route facing disruption.
A cargo vessel was attacked near the Bab el-Mandeb Strait on August 11, killing three crew members, according to Yemeni officials cited by Reuters. The waterway connects the Gulf of Aden with the Red Sea and provides access to the Suez Canal, according to Reuters
Threats around Bab el-Mandeb are especially significant because Saudi Arabia has been using Red Sea infrastructure to bypass Hormuz.
If vessels cannot safely use either route, shipping companies may be forced to take much longer journeys around southern Africa. Those voyages consume more fuel, require additional crew time and keep ships occupied for longer periods, effectively reducing available global shipping capacity.
Insurance costs have also increased. Reuters reported in July that war-risk insurance prices for some voyages through the southern Red Sea had doubled following Houthi threats and attacks.
The simultaneous disruption of two major waterways therefore creates a broader supply-chain problem extending beyond energy. Container shipping, dry bulk commodities and manufactured goods moving between Asia and Europe could all face higher costs and longer delivery times.
Three scenarios for oil and global markets
Investors should distinguish among three possible outcomes.
A comprehensive settlement that restores secure commercial passage would probably remove a substantial part of oil’s geopolitical premium. Freight and insurance rates could fall, although traffic would take time to normalize as shipowners assessed security and mine-clearing operations.
A full military escalation involving sustained attacks on tankers or energy infrastructure could push oil sharply higher. The severity would depend on the duration of disruption, the availability of strategic reserves and whether alternative pipelines and ports remained operational.
The third scenario—a prolonged partial closure—may now be the most plausible. Limited volumes could continue moving while periodic attacks keep most major tankers and LNG carriers away.
Under that outcome, Brent could remain volatile within a relatively high range rather than producing a single extreme price spike. Businesses would face recurring freight disruptions, while central banks would have to incorporate higher energy costs into their inflation forecasts.
What investors should watch next
The first indicator is actual vessel traffic. A durable recovery would require more than a few small ships crossing the strait. The return of VLCCs and LNG carriers would provide stronger evidence that large energy flows can resume.
Insurance pricing is equally important. Even a political announcement may have limited effect if underwriters continue charging prohibitive premiums or excluding war-related damage.
Oil-export data from Saudi Arabia and the UAE will show how effectively bypass routes are replacing lost Hormuz capacity. Refinery purchases from the United States, West Africa and other regions will indicate how quickly Asian buyers are diversifying.
Diplomatic statements should be treated cautiously unless accompanied by verifiable operational changes. Previous agreements produced temporary optimism without restoring normal traffic.
Finally, investors should follow inflation expectations and bond yields. If Brent remains above $90 for an extended period, markets may increasingly price a longer period of restrictive monetary policy—even if economic growth weakens.
The latest vessel attack illustrates the central risk: Hormuz does not need to close completely to damage the global economy. A waterway operating at a fraction of normal capacity, under constant threat of attack, could keep energy and transportation costs elevated for months.
That would turn the conflict from an acute market shock into something more difficult to manage—a persistent tax on trade, consumption and economic growth.
