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Oil climbs as fading US-Iran peace hopes raise supply risks

By Thomson Reuters Aug 17, 2026 | 8:13 PM

By Ishaan Arora

Aug 18 (Reuters) – Oil prices rose on Tuesday as a deal to end the Middle East war seemed further out of sight with Iran saying it will adopt a more offensive stance and the U.S. ​ruling out extending a ceasefire agreement, heightening worries about energy supply.

Iran will ‌shift to a “fully offensive” military posture because efforts to negotiate a permanent end to the war with the U.S. have stalled, a senior Iranian official told Reuters on Monday, as Washington ruled out extending a temporary ceasefire agreement.

Outward progress towards peace talks and a resumption of oil tanker traffic through ‌the ​strategic Strait of Hormuz has ground to a halt, ⁠threatening to extend the conflict ⁠that the U.S. and Israel launched with attacks on Iran on February 28.

Brent crude futures climbed 27 cents, or 0.3%, to $91.14 by 0003 GMT, after rising to their highest since July 30 on Monday.

U.S. West Texas Intermediate crude futures were ​up 42 cents to $85.04 a barrel, after gaining more than 1% earlier in the session to $85.37, their highest since July 31.

“Oil has jumped to start the week ⁠as U.S.-Iran relations look increasingly shaky. A deal to ⁠reopen the Strait of Hormuz still does not appear to ​be in sight, and shipping numbers remain at a trickle,” said chief market analyst at ​KCM, Tim Waterer.

Following attacks on tankers, only five commodity vessels transited the ‌Hormuz strait on Saturday, with none registered for Sunday, ship-tracking data from Kpler showed, versus 31 in the prior weekend.

Yemen’s Houthis attacked what they described as a Saudi military ship and four escort vessels in the Red Sea with missiles, according to the ⁠group’s military spokesperson Yahya Saree on Telegram.

“The dual chokehold on the Strait of Hormuz and the Bab el-Mandeb remains highly significant. These are not secondary concerns. They sit at ⁠the centre of the current ‌supply-risk narrative,” KCM’s Waterer said.

Iran has separately been negotiating an ⁠agreement on managing the strait with Oman and says they ​are close ‌to a deal. But Trump responded to those negotiations with ​a threat ⁠to bomb the Gulf state, a longstanding U.S. security partner.

In a glimmer of hope for diplomacy though, media reports said Trump had opened back-channel discussions with the Islamic Revolutionary Guard Corps.

U.S. crude oil stockpiles were expected to have fallen last week alongside product inventories, a preliminary Reuters poll showed on Monday. [EIA/S]

(Reporting by Ishaan Arora in Bengaluru; Editing by Chris ​Reese and Muralikumar Anantharaman)