Oil prices rebounded 1% on Tuesday from a plunge in the previous session, fuelled by concerns that ‌Middle East supply remains at risk as a diplomatic resolution to the U.S.-Iran war that has disrupted shipments still seems unlikely.

Front-month Brent futures rose $1.12, or 1.3%, to $84.89 a barrel by 0355 GMT after dropping 7% in the previous session to a three-week low.

U.S. West Texas Intermediate (WTI) crude was up ​77 cents, or 1%, at $81.11 after falling more than 5% in the previous session to stand at its ​lowest in nearly a week.

Prices dropped after U.S. President Donald Trump said on Sunday he was ⁠holding off on new attacks on Iran pending ongoing talks to end their war and settle claims over control of the key ​Strait of Hormuz.

The strategic waterway, which connects Gulf oil producers to global markets, was a channel for about a fifth of ​global shipments of crude oil and natural gas before the conflict.

However, on Monday, Iran's Foreign Ministry spokesman Esmail Baghaei rejected Trump's claim, saying no negotiations with the U.S. were taking place and no meetings were scheduled.

"The scale of the sell-off seems fairly overdone, given that there's still considerable uncertainty. ​We’ve been in this situation multiple times before, only to see things unravel," ING analysts said in a note.

"And with Iran ​denying that any talks are underway and Trump issuing warnings if no deal materialises, the backdrop clearly leaves ample room for a renewed ‌escalation."

The Hormuz ⁠dispute is a central sticking-point in talks. Washington says the memorandum of understanding agreed in June required Iran to open the waterway, while Tehran says the text explicitly preserved its authority.

Analysts at Barclays said crude oil and refined product net exports through the strait averaged 4.2 million barrels per day in the week ended July 31, versus 3.2 million the previous week.

In the ​Red Sea, six Saudi-flagged supertankers changed course ​in the Gulf of ⁠Aden recently for southern Africa, while two tankers laden with Saudi oil crossed the Bab el-Mandeb Strait, shipping data showed on Monday.

Shipping traffic at the key Gulf waterways of Bab el-Mandeb and ​the Strait of Hormuz held largely unchanged at the start of the week.

Hormuz remains dangerous for ​vessels. On Tuesday, ⁠the United Kingdom Maritime Trade Operations agency flagged an incident 20 nautical miles (37 km) northeast of Oman's Al Khasab, after a cargo vessel broadcast over VHF channel 16 that it had been hit by an unknown projectile.

"While the fighting between Saudi Arabia and the Houthis ⁠has not ​completely halted energy flows, it has forced longer voyage times, higher insurance ​costs and occasional diversions," said Tim Waterer, chief market analyst at KCM Trade.

"With the Strait of Hormuz, it keeps a dual-chokepoint risk in the market that prevents ​oil from fully unwinding its geopolitical premium."