Brent crude futures climbed 3.2% to US$78.43 a barrel in early Asian trade, extending a volatile week that saw the benchmark gain 5.4%.
The sharp repricing follows a renewed exchange of military strikes between the United States and Iran, which has cast fresh doubt on the stability of the Strait of Hormuz.
The market reaction underscores the persistent risk premium attached to Middle East shipping routes.
Despite earlier diplomatic efforts to stabilize the region, the latest escalation has forced traders to reassess the probability of supply disruptions.
The Strait of Hormuz remains the focal point of this anxiety, as it handles a significant portion of global oil flows.
Any threat to its free navigation immediately translates into higher energy costs and tighter supply expectations.