Crude oil prices fell nearly 4% on Tuesday as renewed hopes of negotiations involving Iran reduced the immediate risk premium attached to Middle East supply disruptions, despite continued U.S. sanctions pressure and severe restrictions on tanker traffic through the Strait of Hormuz.
As of 5:15 p.m. WAT, Brent crude had declined $3.41, or 3.70%, to $88.76 a barrel, while U.S. West Texas Intermediate (WTI) fell $2.89, or 3.40%, to $82.12 a barrel.
The decline came as markets responded to signs that diplomatic efforts could reopen a path towards negotiations with Tehran. Pakistan's mediation efforts have helped revive expectations of a negotiated settlement, countering some of the bullish pressure created by Washington's latest sanctions measures against Iran.
The renewed diplomatic possibility has encouraged traders to reduce some of the premium built into crude prices over fears that the conflict could trigger a wider disruption to Middle Eastern oil supplies.
The market had initially faced renewed upward pressure after U.S. Treasury Secretary Scott Bessent announced expanded sanctions targeting Iran's economic lifeline. Washington has threatened to penalise commercial partners that continue doing business with Tehran, including through possible exclusion from the dollar-based financial system.
However, the United States has not identified the countries that would face penalties or specified when the measures would take effect. Bessent said affected countries would be given time to comply.
That uncertainty, combined with the prospect of mediation, has shifted market attention away from an immediate escalation towards the possibility that diplomatic engagement could contain the conflict.
Ole Hansen, head of commodity strategy at Saxo Bank, said the shift from military confrontation towards economic pressure had reduced some of the anxiety in the oil market. He also noted that the sanctions announcement was less forceful than some market participants had anticipated.
Iran has vowed to retaliate against the expanded U.S. sanctions but has expressed confidence that major trading partners will resist Washington's pressure campaign. U.S. Defense Secretary Pete Hegseth, meanwhile, has maintained that Washington has not ruled out military force against Tehran.
The possibility of negotiations has therefore emerged as a key factor behind Tuesday's price decline, even as physical supply risks remain significant.
Iran's ability to disrupt shipping remains one of the market's principal concerns. The Strait of Hormuz, through which roughly one-fifth of global oil consumption typically passes, remains severely restricted.
Only two commodity vessels crossed the waterway on Monday, according to shipping data, compared with a 10-day average of about 14 vessels. The sharp decline in traffic highlights the extent to which the conflict has disrupted the normal movement of crude and petroleum products.
Iran has also blacklisted 45 tankers it says violated its rules for crossing the Strait of Hormuz. The vessels could face fines, detention and cargo confiscation, while ships conducting ship-to-ship transfers with the blacklisted tankers could also be added to the list.
The restrictions cover crude oil tankers, LNG and LPG carriers and clean-product vessels, including ships associated with major Gulf shipping companies.
The escalation has added another layer of uncertainty to an already disrupted maritime market. Yet the prospect of negotiations has, for now, outweighed those risks in price formation.
Tim Waterer, chief market analyst at KCM, said Iran still has the ability to disrupt shipping, meaning a residual risk premium remains embedded in crude prices.
The physical risks were underscored on Tuesday when an oil tanker was struck by an unidentified projectile and disabled about nine nautical miles, or 16.7 kilometres, northeast of Oman's Ash Shishah, according to the United Kingdom Maritime Trade Operations.
The conflict has also forced countries to draw down commercial and strategic oil inventories as governments prepare for possible prolonged supply disruptions.
At the same time, Iran's own oil exports are under increasing pressure. Its crude exports in August have reportedly fallen sharply from the 2025 average of around 1.7 million barrels per day, with flows averaging only about 300,000 barrels per day and only one confirmed loading reported at Kharg Island, the country's largest export terminal.
Chinese buyers have continued taking Iranian crude, with imports estimated at around 800,000 barrels per day, partly supported by stocks accumulated during a three-week period of relatively free navigation in June and July. However, those inventories are being depleted, raising the prospect of further reductions in Chinese purchases next month.
Iranian floating storage outside the Gulf has also fallen to about 24 million barrels, down roughly 7 million barrels since the beginning of August.
The pressure on Iranian exports has been reinforced by the U.S. naval blockade, while Tehran's threats against shipping have further complicated the movement of crude through Hormuz.
Elsewhere, supply risks are also emerging. A Ukrainian drone strike damaged Russia's Novoshakhtinsk refinery in the Rostov region, forcing the facility to suspend operations. Russia has also been considering extending its diesel export restrictions through October following repeated attacks on southern refineries and pressure on domestic fuel supplies.
In Kazakhstan, a fire was reported at the Atyrau refinery, while operations at ExxonMobil's Liza Unity floating production vessel in Guyana were temporarily suspended following a fire.
Despite the accumulation of these supply-side risks, crude prices moved sharply lower on Tuesday as traders placed greater weight on the possibility that negotiations could prevent the conflict from developing into a broader disruption of global oil flows.
The decline suggests the market is beginning to price a potential diplomatic pathway into the Iran crisis, although the underlying risks have not disappeared.
For now, the direction of oil prices is likely to remain closely tied to whether Pakistan's mediation efforts can translate into substantive negotiations and whether those talks can reduce the threat to shipping and energy infrastructure in the region.
A sustained diplomatic breakthrough could remove a significant portion of the risk premium that has supported crude prices. Conversely, renewed military escalation, further restrictions on Hormuz traffic or additional attacks on oil infrastructure could quickly reverse Tuesday's decline.