The U.S. launched military strikes against Iran hours after the Treasury revoked a sanctions waiver that had permitted global purchases of Iranian oil, escalating a confrontation triggered by attacks on commercial tankers in the Gulf. The near-simultaneous moves signal a coordinated pressure campaign that removes the last legal channel for Tehran's crude exports and raises the risk of supply disruption in a market already balancing tight inventories.

Revoking the waiver effectively forces buyers in China, India, and elsewhere to halt purchases or face secondary sanctions, removing up to 1 million barrels per day of Iranian supply from legitimate trade. Tanker insurance and financing costs are likely to spike as underwriters reassess war-risk exposure in the Strait of Hormuz, where roughly 20% of global oil flows transit.

Oil benchmarks jumped on the news, with Brent crude climbing above $65 a barrel as traders priced in a higher geopolitical risk premium. Energy equities and shipping rates for Very Large Crude Carriers also surged, reflecting expectations of longer voyages and tighter vessel availability.

The episode underscores how quickly sanction policy can shift from economic tool to military trigger. Investors should monitor whether OPEC+ responds with output adjustments or if the International Energy Agency coordinates a strategic reserve release to calm prices.