Brent crude rose by 3 per cent on Tuesday after the U.S. military ​carried out strikes in Iran, adding to uncertainty ‌over whether a deal will be imminently reached to end the war and open up shipping flows through the Strait of Hormuz.

U.S. Secretary of State Marco Rubio said on Tuesday that ⁠negotiating a ​deal with Iran could “take a few days,” quashing hopes for an imminent end to the conflict a day after U.S. forces conducted what Washington called defensive strikes in southern Iran.

“We are still waiting for more details on a potential deal,” said ​Giovanni Staunovo at UBS. ”Meanwhile we see renewed tensions in ‌the Middle East, while flows through the Strait remain restricted.”

Global benchmark Brent was up US$2.95, or 3.07 per cent, to US$99.09 a barrel as of 9:13 a.m. ET, after settling 7 per cent lower on Monday. U.S. West Texas Intermediate was down US$3.78, or 3.91 per cent, from Friday’s close, at US$92.82. There was no WTI settlement on Monday due ‌to the ​U.S. Memorial Day holiday.

“While differences between the parties have narrowed, any eventual peace ​deal would likely lead only to a gradual reopening, ⁠meaning the current tight supply outlook could take months to normalize,” said ⁠Ole Hansen at Saxo Bank.

Tehran has effectively halted nearly all non-Iranian shipping into and out of the Gulf ​via the Strait of Hormuz since the war began, choking off about a fifth of global oil and liquefied natural gas flows.

The strikes happened as Iran’s top negotiator and its foreign minister were in Doha for talks with Qatar’s prime minister on a potential deal with the U.S. to end ⁠the three-month-old war.

Both Washington and Tehran said they have made progress on a memorandum of understanding that would halt the war and give negotiators 60 days to reach a final deal.

Nikkei reported, citing a Middle East diplomatic source, that Iran would clear mines from the Strait within a 30‑day window under the agreement, ⁠after which vessels from all countries could navigate freely ​and safely, with Tehran also ending transit-fee collection.

Ship-tracking data showed that three LNG tankers passed ⁠through the Strait in recent days, heading to Pakistan, China and India, along with a supertanker carrying Iraqi crude ‌to China that had been stranded for nearly three months.

U.S. President Donald Trump on Monday repeated ​his demand that Iran hand over its enriched uranium so it could be destroyed.

“It’s a sharp reminder that the deal could still collapse at the 11th hour, much like the five previous attempts before it,” said Tony Sycamore, a ​market analyst at IG.

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