Frankfurt, July 14, 2026

Donald Trump announced the resumption of a naval blockade against ships heading to or departing from Iranian ports shortly after new US strikes on Iran, prompting oil prices to climb sharply on Monday.

Trump communicated the decision on his platform Truth Social. According to the announcement, 20 percent of the cargo value will henceforth be levied as a contribution for safe passage through the strait, intended to offset the costs incurred in securing the passage. The responsible regional command of the US military (Centcom) later stated that it intended to resume the blockade as of Tuesday afternoon US Eastern Time, corresponding to 10:00 PM German time. Further details remained unclear, including who exactly is to bear the contribution.

Commodity markets: Brent and WTI post strong gains

The announcement was immediately reflected on the commodity markets. The price of the global benchmark grade rose by just under nine percent. A barrel (159 liters) of the North Sea Brent crude for delivery in September last cost 82.75 US dollars. US oil WTI became 1.6 percent more expensive at 79.37 dollars per barrel. Even though the Brent grade thus remains well below the highs seen at the beginning of the conflict – at one point a barrel of the benchmark Brent grade had cost somewhat more than 126 dollars – the move heightened concerns about supply bottlenecks at the Strait of Hormuz. Oil prices significantly extended their already substantial gains as Monday progressed.