Crude futures edged higher in midday trading on Monday after President Trump said Iran would pay for the deaths of three US service members, while Houthi militants in Yemen declared a maritime embargo on Saudi Arabia.
Front-month West Texas Intermediate crude futures rose 0.4% to $82.90 per barrel, while Brent futures advanced 0.9% to $88.90/bbl.
Soojin Kim, research analyst at MUFG, said crude prices rose after the US and Iran sharply escalated hostilities, heightening concerns over disruptions to Middle East oil supplies.
Kim said the latest developments included continued US strikes on Iranian military targets, Iranian attacks on shipping in the Strait of Hormuz, damage to a major Kuwaiti oil facility, and renewed Houthi threats.
On Monday, Trump warned Iran that it would face a severe response for any killing of American military personnel, saying Tehran would "pay" for such actions multiple times over. "Every time Iran kills an American Soldier they will pay for that killing many times over!" Trump said in a post on Truth Social.
Trump's warning comes amid heightened US-Iran tensions, with regional security risks continuing to weigh on energy markets and shipping routes across the Middle East.
US Central Command said on Sunday that it bombed Iran for the ninth consecutive night in retaliation for repeated attacks on commercial vessels transiting the Hormuz. Iran, in response, continues to attack US bases in the likes of Kuwait, Jordan, Bahrain and Iraq.
Iran's Houthi allies in Yemen, meanwhile, declared a maritime embargo against Saudi Arabia on Monday.
The Yemeni Armed Forces declare a maritime embargo against the criminal Saudi enemy effective immediately upon the issuance of this statement, Houthi rebel spokesperson Yahya Saree said in a video published on X.
The Houthis have repeatedly threatened to close the Bab el-Mandeb Strait during the Middle East conflict. A wider conflict with the Houthis could jeopardize Saudi Arabia's oil exports through its East-West Pipeline, which allows crude to bypass the Strait.
President Trump updated UK Prime Minister Andy Burnham on developments in the Middle East on Monday and discussed efforts to ensure the safe passage of commercial shipping through the Hormuz.
However, Iran reportedly confirmed receiving proposals from "certain" mediators aimed at preventing further escalation of tensions with the US.
Esmail Baghaei, the spokesperson of Iran's foreign ministry, said during his weekly press briefing on Monday that mediators are actively striving to prevent further escalation and have conveyed proposals to Tehran, but he did not give further details.
The US-Iran hostilities have disrupted energy flows through the Strait, with the shipping data from Kpler showing that traffic remained below normal levels, with only 30 verified transits recorded between July 17 and 19.
Kpler said that while the International Maritime Organization's incident tracker shows no additional confirmed attacks since July 16, the broader security environment remains fragile.