Oil prices climbed to their highest levels in four weeks on Tuesday as the escalating military confrontation between the United States and Iran combined with fresh threats to shipping through the Strait of Hormuz prompted traders to price in the risk of prolonged energy supply disruptions through one of the world’s most critical chokepoints.
Brent crude futures rose 3.8 percent to $86.47 per barrel, their highest level since mid-June, while West Texas Intermediate gained 2.8 percent to $80.29, its strongest reading since just before Washington and Tehran signed the memorandum of understanding that had temporarily ended hostilities and reopened the strait to commercial shipping. Both benchmarks reached their peaks in early morning trading before pulling back slightly.
What drove the price surge
The immediate catalyst for the market move was President Trump’s announcement on Monday that the United States was reinstating its blockade of Iranian shipping and would impose a 20 percent fee on all cargo transiting the Strait of Hormuz. The declaration followed Trump’s assessment that the interim ceasefire agreement with Tehran had collapsed after a weekend of heavy missile and drone exchanges between American and Iranian forces.
The fee announcement was particularly significant for energy markets because it raised a structural question that had not previously existed in the conflict: whether the cost of moving cargo through the strait, regardless of nationality or cargo type, would now include a mandatory American levy. If enforced, a 20 percent surcharge on all shipping through a waterway that handles a large share of the world’s daily crude oil and liquefied natural gas flows would represent a material increase in global energy transport costs, with effects that would extend well beyond the bilateral conflict itself.
The southern corridor and Iran’s response
Part of the complexity driving the price reaction is the state of the shipping routes through the strait itself. The United States has been working to establish a shipping corridor along a southern route closer to the Omani coastline as an alternative to the northern passage that runs through waters where Iran exercises greater influence. Iranian forces have been attacking vessels using or moving toward the southern corridor, and American forces have responded by striking Iranian military infrastructure along the Hormuz coastline.
The result is an environment in which neither of the main routing options through the strait is operating normally. The northern corridor is effectively controlled by Iran and carries the risk of Iranian interference. The southern corridor is operationally viable in principle but has been the target of attacks that complicate its use as a reliable alternative. Commercial operators trying to move cargo through the strait face elevated risk regardless of which route they choose, and the insurance and operational costs that accompany that risk are reflected directly in freight rates and ultimately in the price of the energy commodities being transported.
The market context
The price levels reached on Tuesday represent a significant reversal from the period following the ceasefire, when crude prices had fallen sharply as the immediate threat to Hormuz shipping appeared to be resolved. Brent had dropped from above $109 per barrel before the ceasefire to approximately $76 in the weeks following its signing, as the market priced in normalized flow through the strait.
Tuesday’s move back above $86 reflects a partial unwinding of that decline as the ceasefire’s collapse makes the earlier pessimism about disruption look more justified than the brief period of optimism that followed the agreement. How far prices move from here will depend on the military and diplomatic developments of the coming days and whether any mechanism emerges to contain the conflict before it produces the kind of sustained supply disruption that would push crude substantially higher.
