Brent crude futures slid $4.08, or 4.64%, to $83.85 by 2352 GMT while U.S. West Texas Intermediate crude was at $80.66 a barrel, down $4.01, or 4.74%.

Both contracts jumped more than 20% last month after fighting between the U.S. and Iran resumed and as attacks on several tankers around Oman heightened security concerns, deterring shippers from entering the Gulf to load oil.

In a sign of de-escalation, Trump said late on Saturday on his Truth Social platform that Iran and other Middle Eastern countries had asked for time to complete a deal that would lead to "the Immediate, Complete and Total" reopening of the vital strait and "an end to Iran's nuclear threat".

"The bigger focus is whether this week turns into a rinse and repeat of last week - with hopes of a deal collapsing as Iran digs in its heels and continues to leverage its control over the Strait, potentially through an attack on a U.S. base or a tanker transiting the waterway," IG market analyst Tony Sycamore said.

Due to export disruptions from the Gulf, Russia and Kazakhstan caused by the Iran and Ukraine wars, successive monthly OPEC+ hikes over most of this year have remained largely on paper with little impact on the market.

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