Global oil markets experienced a significant shock on Monday, with crude prices climbing over 9% to reach their highest levels in a month. This sharp spike was triggered by the U.S. government’s announcement that it would reinstate a comprehensive naval blockade along Iran’s entire coastline. The move, which encompasses all ports, oil terminals, and vessels regardless of their national flag, has reignited fears regarding the security of energy shipments moving through the critical Strait of Hormuz. Following the news, Brent crude futures surged to $83.30 per barrel, while U.S. West Texas Intermediate hit $78.14, marking the most substantial single-day gains for both benchmarks in several months.

The tension escalated after President Donald Trump confirmed the reinstatement of the blockade and suggested that the U.S. would levy a 20% surcharge on cargo passing through the strait, a proposal that has drawn sharp criticism from the UN’s shipping agency. With Iran’s military command vowing to block any unauthorized U.S. interference, the geopolitical standoff is creating a significant risk premium in the energy market. Analysts are now closely monitoring tanker traffic through the region, noting that any further decline in flow could severely disrupt global supplies, as the Strait of Hormuz typically facilitates roughly one-fifth of the world’s daily oil and liquefied natural gas shipments.