Crude futures retreated in midday trading on Monday after the US launched a fresh sanctions campaign against Iran, aimed at severing the country's global financial lifelines.
Front-month West Texas Intermediate crude dropped by 2.5% to $84.88 per barrel, while Brent futures slipped 2.6% to $91.97/bbl.
US Treasury Secretary Scott Bessent on Monday unveiled what he described as an "unprecedented" Washington campaign to sever Tehran from the global economy, warning that any state doing business with the country risks facing US sanctions.
"... we are launching an economic onslaught against Iran's financial connections around the globe. Our objective is to sever every economic lifeline that sustains this tyrannical regime until Tehran stands alone," Secretary Bessent said.
Bessent said the campaign targets five sectors that Treasury identified as vital to Iran's economy: digital assets, technology, gold, aviation and shipping.
Treasury's Office of Foreign Assets Control is also sanctioning 60 entities, individuals and vessels worldwide over Iran's procurement of nuclear and missile technology, cyber operations and oil revenue.
Iran has condemned US plans to announce new sanctions and vowed to retaliate against any country that supports Washington, as President Masoud Pezeshkian has called for a diplomatic solution.
On Monday, Iran's Islamic Revolutionary Guards Corps spokesman warned the US of heavy strategic blows to its energy bottlenecks and vital interests.
"Today, America has well understood that if it implements its threats against Iran's infrastructure, it will face heavy strategic blows to its energy bottlenecks and vital interests," IRGC spokesperson Hossein Mohebbi said, according to the state-owned Islamic Republic of Iran Broadcasting.
Mohebbi said targeting or threatening individuals would not disrupt Iran's administration because the country's political system rests on strong ties between the government and its people.
On Monday, Pakistan Army Chief Asim Munir visited Iran to promote regional peace and stability amid heightened tensions rise between the US and Iran.
Omani Foreign Minister Sayyid Badr Albusaidi is reportedly set to visit Iran on Tuesday for bilateral talks with Iranian Foreign Minister Abbas Araghchi.
Meanwhile, Iran's Persian Gulf Strait Authority said on Sunday it had blacklisted 45 tankers for violating its transit rules in the Hormuz, noting that the vessels could face penalties, including "fines, seizure, or confiscation" during future passages.
Saxo Bank strategists said that the US sanctions on Iran could further tighten global oil supplies, with Iranian exports already disrupted and offers to China reduced.
Analysts said Iran dismissed the threat, saying it can withstand sanctions and maintain trade elsewhere, while tensions in the Strait of Hormuz remain high and traffic is still below normal.
Commercial vessel traffic through the Hormuz and Bab el-Mandeb remained resilient last week, the latest data from Kpler showing 121 crossings, a 2.5% increase from 118 the previous week, while Bab el-Mandeb reported 269 crossings, up 3.1%.