The collapse of the Islamabad talks has pushed the crisis into a far more dangerous phase. President Donald Trump has now moved from threats to action, authorising a naval blockade aimed at choking off Iranian access to Gulf shipping and cutting Tehran off from vital oil revenue. But while the logic in Washington appears simple, deny Iran export income and force capitulation, the real-world consequences are far more complicated, and potentially far more damaging to the United States and the wider global economy.
First, it is important to state the issue accurately. Reports indicate the US move is not a total closure of every vessel crossing the Strait of Hormuz, but a blockade focused on ships moving to and from Iranian ports. Even so, this is not a minor tactical adjustment. It is a direct assault on one of the world’s most sensitive energy arteries, at a time when the global market is already strained by war, damaged infrastructure, and shipping uncertainty. Reuters and other outlets report that the move is intended to halt roughly 2 million barrels per day of Iranian oil from reaching buyers, while broader disruptions linked to the conflict have already removed around 10 million barrels per day from the market.
That matters because Hormuz is not just Iran’s problem. The strait remains one of the central valves of the global energy system, carrying about one fifth of global oil and gas flows. Any attempt to weaponise traffic in that corridor sends immediate shockwaves through prices, insurance costs, freight risk, inflation expectations, and investor confidence. This is exactly what the world has begun to witness, with Brent crude surging above $100 a barrel after the blockade announcement before easing slightly as markets clung to hopes of renewed diplomacy.
This is where the policy begins to look self-defeating. Washington may calculate that cutting Iranian exports will cripple Tehran financially. But the same move also tightens an already stressed market, raises fuel costs worldwide, and punishes oil importing countries far beyond Iran’s borders. The IMF, World Bank and International Energy Agency have already warned governments against hoarding supplies or imposing export controls because the present energy shock is severe enough to worsen inflation, depress growth, and deepen hardship in vulnerable regions, especially poorer importing economies in Asia and Sub-Saharan Africa.
In other words, Iranian oil is not some isolated stream that can be switched off without consequence. However politically inconvenient it may be for Washington to admit, Iranian barrels have been part of the cushioning mechanism that helps prevent an even sharper global price explosion. That is one reason this confrontation is not merely about punishing Tehran. It is also about whether the US is prepared to absorb the economic blowback of its own coercive strategy.
There is another strategic problem. Even if the blockade hurts Iran, there is no guarantee it will produce surrender. Some estimates suggest Iran could lose hundreds of millions of dollars a day if the blockade is effectively enforced. But analysts also note that Tehran has built up a very large floating stockpile of crude outside the immediate chokepoint, reportedly around 154 to 160 million barrels, much of it linked to Chinese buyers. That stockpile could soften the shock for weeks or even months, blunting the immediate impact of Washington’s pressure campaign.
That means the United States may have chosen a tool that is painful enough to inflame tensions, but not decisive enough to force a quick political outcome. This is the worst of both worlds. Iran is squeezed, but not broken. Global markets are rattled, but not stabilised. America’s allies are alarmed, but not fully on board. Indeed, key Western partners such as Britain and France have reportedly distanced themselves from direct military participation, preferring diplomacy and maritime de escalation over a widening confrontation.
Russia has also warned that the blockade will have serious consequences for international markets, while Saudi Arabia is reportedly pressing Washington to drop the move out of fear that Iran and its allies could retaliate elsewhere, including around Bab al-Mandeb, another strategic maritime corridor. That is how regional coercion can turn into systemic instability. Once one chokepoint is militarised, others come under threat, and the costs multiply.
The market response itself tells the story. ANZ has raised its oil forecasts because of supply losses connected to the conflict, while Morgan Stanley says supply recovery could take months even if Hormuz reopens more fully. The IEA has already coordinated a massive 400 million barrel emergency release from reserves, including 172 million barrels from the US Strategic Petroleum Reserve, yet even that extraordinary intervention is being described as temporary relief rather than a durable solution.
That is why the triumphalist assumption behind this policy looks deeply flawed. The Trump administration is acting as if economic strangulation will produce obedience. But energy wars rarely unfold so neatly. The more likely outcome is a chain reaction: higher oil prices, renewed inflation, global political pressure, nervous allies, alternative smuggling and rerouting networks, and an emboldened narrative in Tehran that the US is using collective punishment to achieve strategic goals it could not secure at the negotiating table.
So yes, denying Tehran oil income may hurt Iran. But it also threatens to raise costs for the very international system Washington claims to lead. The real question is not whether the blockade can inflict pain. It plainly can. The real question is whether the United States can control the consequences once that pain ricochets through energy markets, alliances, and the wider global economy.
That is why this may prove to be less a masterstroke than a desperate escalation by an administration that is, in truth, playing an increasingly weak and risky hand. The longer the disruption lasts, the more the world will be forced to confront an uncomfortable fact: in a tightly interconnected oil market, punishing Iran is no longer a clean exercise in power projection. It is a gamble with global consequences.
By Chima Nnadi-Oforgu
Duruebube Uzii na Abosi
for Oblong Media Global Intelligence
OBLONG MEDIA GLOBAL INTELLIGENCE 
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