Brent Climbs as Iran-US Talks Stall, Diesel Ban Uncertainty Persists

Thursday, September 24, 2026 | 6:30 AM ET

Brent (Nov) $104.58 | WTI (Nov) $93.21

Brent +$1.50 after touching $106.50 intraday, WTI +$1.05. Reports say Iran gave the US one week to meet its publicly stated demands, chiefly lifting the naval blockade. A senior Iranian official told Reuters Tehran and Washington remain divided but diplomacy must continue, a day after Iran's president told the UN General Assembly Tehran would never surrender to US pressure. A White House official denied a report the US is preparing a 90-day diesel export ban; European diesel futures held near record highs regardless.

Bottom Line

The one-week deadline Iran reportedly gave the US is worth treating as a negotiating device rather than a fixed trigger. Iran's president told the UN General Assembly Tehran would never surrender to US pressure, a public line that's hard to walk back quickly, even as a senior Iranian official privately told Reuters that diplomacy must continue and that Tehran is reviewing Washington's response to its peace proposals. Those proposals still center on lifting the naval blockade and reopening Hormuz, the same two conditions that have anchored Iran's position for weeks. The gap between the public defiance and the private acknowledgment that talks need to keep going is the more informative signal here than the deadline itself. Adding to this a story from the Times of Israel yesterday reporting that US negotiators dismissed an Iranian offer to reopen Strait of Hormuz, telling Tehran that it does not control the waterway and questioning its standing to make such an offer.

The diesel export ban denial doesn't really settle anything. A White House official pushed back on the 90-day ban report, but European diesel futures stayed near record highs anyway, since the underlying scarcity that's been driving those prices, Hormuz-constrained Middle East supply plus Russian refinery damage, hasn't changed regardless of what Washington does on exports. Analysts have already made the case that a ban would likely worsen rather than ease the situation by cutting off a supply source Europe has come to depend on, and today's denial doesn't remove the risk that the idea resurfaces.

China's inventory data adds a genuinely new wrinkle to the fourth-quarter supply picture. GL Consulting's numbers show gasoline stocks at their lowest since 2011 and diesel at their lowest since 2015, even as August exports rebounded to pre-war levels and are expected to hold that pace into September. That combination, strong exports plus falling domestic stocks, is squeezing Beijing's options, and Rystad expects October export volumes to fall as state refiners prioritize domestic supply security over the export margins they've been enjoying. Rystad's Ye Lin laid out the mechanical bind clearly: high crude costs are already forcing independent refiners to trim runs, state refiners are entering seasonal maintenance at the same time, and neither group has room to absorb the other's shortfall. That's why Rystad cut its Q4 China refinery throughput forecast by 880,000 bpd to 13.9 million, and why Energy Aspects lowered its Q4 crude import forecast to 9.2 million bpd. If China's export window narrows in October as expected, that removes some of the diesel relief that's been reaching global buyers just as Europe's own supply options are already constrained.

Domestic U.S. inventory data pulled in different directions: distillate stocks fell 428,000 barrels to 107.4 million, consistent with the broader diesel tightness, while crude stocks rose 3 million barrels against an expected 641,000-barrel draw, a build large enough to raise the same kind of questions about near-term demand that recent unexpected U.S. builds have prompted.