Crude oil prices have surged to their highest levels in days as diplomatic efforts to reopen the strategically critical Strait of Hormuz remain stalled, with Iran demanding the US lift sanctions and end military threats.

Oil markets experienced significant gains on Monday as concerns mounted over the prolonged closure of the Strait of Hormuz, a vital global shipping route. Brent crude futures climbed more than $2 to trade at $84.64 per barrel, representing a 3.3 percent increase for the day, while US West Texas Intermediate crude rose 3.1 percent to $80.63.

The price movement reflects shifting investor sentiment following a temporary decline last week when markets briefly rallied on hopes that negotiations between Tehran and Washington might produce a breakthrough. That optimism has now faded as Iran has set conditions for reopening the waterway, including the cessation of US military threats, removal of economic sanctions, and provision of compensation. SEB Research analysts noted that current price levels between $80 to $85 per barrel still incorporate expectations of a near-term resolution, though uncertainty persists.

The volatility has created ripple effects across consumer fuel prices. The American Automobile Association reported that US petrol prices fell nine cents over the previous week to an average of $4.00 per gallon, down from $4.09. However, petroleum analysts caution this reprieve may be temporary. Patrick De Haan of GasBuddy warned that if the strait situation deteriorates, national average fuel prices could reach record levels for late in the calendar year.

Energycompanies have responded positively to the supply concerns. Major oil and gas stocks climbed in US trading, with ExxonMobil up 2.9 percent, Chevron rising 3.1 percent, BP gaining 2.1 percent, and ConocoPhillips advancing 2.7 percent.