Brent crude climbed 2.3% to above $104 a barrel in early Friday trading — not because the news from the Gulf was good, but because it was once again bad. The previous three sessions had seen oil prices shed nearly six percent on statements from President Donald Trump that US-Iran negotiations were entering their “final stages.” Then Iran’s Supreme Leader issued an order that enriched uranium must not leave Iranian soil, Tehran announced a permanent toll framework for the Strait of Hormuz, and the market reversed course with something approaching relief. This is what passes for good news in May 2026: another deal that didn’t materialise, and another day the war continues.

The contradiction at the heart of these markets is not irrational. It is the product of a genuine structural crisis.

A War That Changed the Numbers

US and Israeli-led strikes against Iran began on February 28, 2026. By March 4, Iranian forces had declared the Strait of Hormuz “closed,” threatening and carrying out attacks on ships attempting to transit one of the world’s most critical chokepoints. The International Energy Agency has since described what followed as the most severe oil supply disruption in recorded history — removing more than 14 million barrels per day from global markets at a stroke. Congress.gov

The Strait of Hormuz borders Iran and Oman and accounts for roughly 27% of the world’s maritime trade in crude oil and petroleum products. Losing it, even partially, sends supply shocks rippling from Asian refineries to European petrol stations. The IEA’s emergency response — a coordinated release of 400 million barrels from member nations’ strategic reserves, the largest such action in the institution’s history — has served as a temporary bridge. It has not been a solution. Congress.gov

Oil prices that hovered near $65 a barrel before hostilities began have since reached $140 and now sit in a wide, volatile band near $100, roughly 50% above pre-war levels. Every week, traders ask the same question: is a deal close? Every week, the answer turns out to be more complicated than the previous day’s headlines suggested.

The Core Development: The Uranium Wall

The renewed oil price rise on May 22 followed a pattern that has become almost ritualistic for energy traders. On Wednesday, May 20, Trump’s remarks about “final stages” of negotiations sent West Texas Intermediate futures falling more than 5% to close at $98.26 per barrel, while Brent settled at $105.02 — traders aggressively pricing in the prospect of a swift resolution that would reopen the Strait and unleash suppressed Middle Eastern supply. CNBC

By Thursday they had reversed course. The catalyst was a Reuters report that Ayatollah Mojtaba Khamenei had directed that Iran’s near-weapons-grade enriched uranium must not be shipped abroad under any circumstances — a position that strikes directly at the core of America’s demands. The Trump administration has insisted from the outset that dismantling Iran’s nuclear programme, including the physical transfer of its uranium stockpile to a third country, is non-negotiable.

Iran simultaneously announced the creation of what it calls a “Persian Gulf Strait Authority,” framing permanent Iranian oversight of shipping through the Strait as a condition of reopening. US Secretary of State Marco Rubio told reporters that any deal would be “unfeasible” if Iran pursued measures to permanently control shipping through the Strait of Hormuz, adding: “No one in the world is in favor of a tolling system.” CNBC

The whiplash played out across two sessions. By Friday morning, Brent had recovered to $104.88 per barrel while WTI advanced to $97.93 — both benchmarks effectively pricing the same unresolved standoff they’ve been pricing for weeks. CNBC

Prediction markets have drawn their own conclusions. As of May 22, trading platform Polymarket put the probability of a US-Iran nuclear deal by May 31 at just 16%, reflecting what the platform described as trader consensus that “a comprehensive nuclear agreement is unlikely to materialise by the deadline.” The narrow window, the unresolved core disputes, and a pattern of suspended negotiating rounds have done their work on market sentiment.

The picture is more complicated than a simple impasse, however. Oil prices are not merely responding to diplomacy. They are responding to inventory maths — and that arithmetic is becoming alarming.

The Analytical Layer: Why Scepticism Has Become the Trade

Why do oil prices rise when US-Iran peace talks appear to stall?

When negotiations fail to produce concessions on the core issues — Iran’s enriched uranium and Hormuz shipping rights — markets price in the continuation of the supply crisis through the world’s most vital oil transit route. Iran’s refusal to accept US demands signals that constrained supply will persist, pushing crude higher as buyers compete for non-Middle Eastern barrels while the IEA’s emergency reserves draw down toward exhaustion.

That 40-to-60-word answer captures the mechanism. But the deeper story is about how completely investor psychology has been shaped by three months of repeated false dawns.

The pattern has repeated at least four times since April’s ceasefire. Trump signals openness; prices fall sharply as traders price in a deal. Tehran rejects the framework or advances a counter-demand; prices recover. Traders who shorted oil on Trump’s “final stages” comment on May 20 had already experienced the same whipsaw in March and April. The market, burned enough times, has become structurally sceptical of diplomatic headlines — and that scepticism itself has become a source of upward price pressure.

What sustains prices at these levels is not fear of an escalation nobody wants. It is the quiet recognition that the structural floor beneath oil is hardening. Energy executives surveyed by MUFG warned that full normalisation of Middle East oil supply may not occur until 2027, owing to the scale of damage to Gulf energy infrastructure, the time required to recommission idled production, and the security premium that will persist even if tankers are technically permitted to move.

There is also the question of what happens after the IEA’s emergency release runs out. The political signal of 400 million barrels being mobilised was powerful. The physical signal — that those reserves will be fully exhausted by early August — is now arriving on traders’ screens as a countdown.

The uranium deadlock, meanwhile, isn’t a negotiating posture in the conventional sense. Iran watched the 2015 nuclear deal get torn up by Trump himself in 2018, so even if Tehran signed something on enrichment, the credibility that the US would honour it through a future administration is close to zero. That history is embedded in every Iranian calculation at the table. Signing away the only leverage it has retained — nuclear capability and Strait control — would require a degree of trust in American institutional continuity that Tehran’s political class simply doesn’t possess. Invezz

Implications: The Red Zone Is a Date, Not a Metaphor

The clearest articulation of what comes next arrived on Thursday, May 21, not from a bank or a hedge fund, but from the head of the IEA. Speaking at London’s Chatham House, Fatih Birol warned that “we may be entering the red zone in July or August if we don’t see that there are some improvements in the situation.” Al Arabiya

Birol was precise about the arithmetic. The IEA’s coordinated strategic reserve release — the largest in the institution’s history — is now flowing to the market at a rate of about 2.5 million to 3 million barrels per day. At that pace, the initial release will be exhausted by the start of August, coinciding almost exactly with peak summer fuel demand. The IEA has previously said the global market is facing the most severe disruption in its history, despite having entered the crisis with a supply surplus that absorbed the initial shock. That surplus is now gone. Commercial stockdraws have taken its place. Al ArabiyaCNBC

Birol said the crisis in the Middle East has had a worse impact on oil than the two oil shocks of the 1970s combined, and that no country will be immune if it continues in this direction. He reserved particular concern for developing economies in Asia and Africa, which lack the strategic reserve depth of IEA members and face the full force of elevated delivered prices with little hedge capacity. PBS

The scenario modelling from consultancy Wood Mackenzie provides the sharpest version of the stakes. If a Hormuz deal is reached and the Strait reopens by June, Brent spot prices would ease toward around $80 a barrel by end-2026 — a reduction of roughly a quarter from current levels, with significant relief for global inflation, airline fuel costs, and emerging market current accounts. That scenario, however, requires a sequence of diplomatic concessions neither side has yet made.

For companies reliant on Gulf supply chains, the uncertainty has long since forced costly contingency planning. Asian importers are rerouting cargoes around the Cape of Good Hope, adding roughly two weeks to voyage times and embedding a freight premium into delivered crude prices that compounds every month the Strait stays effectively closed. Refiners are locking in hedges at elevated prices they’d rather not be paying. The war’s economic costs are being distributed far beyond the battlefield.

The Opposing Case: Why the Optimists Aren’t Entirely Wrong

It’s worth stating plainly what the constructive view holds, because it is not without foundation.

Rubio acknowledged “good signs” toward an agreement even as he ruled out the tolling proposal. Trump called off planned military strikes at least twice — in late March and again in mid-May — at the request of Gulf Arab allies seeking more diplomatic time. Oman’s sustained involvement as an intermediary adds a credible back-channel with a track record; Omani mediation kept the JCPOA negotiations alive through some of their most difficult phases. Iran’s foreign minister had, in earlier rounds of talks, described a diplomatic solution as something that could be reached rapidly.

There is a version of events in which both sides calculate that continued conflict is more costly than a workable compromise. For Tehran, the war has brought economic devastation, sustained strikes on military infrastructure, and the risk of nuclear facility destruction. For Washington, elevated energy prices, regional instability, and the political costs of a prolonged conflict are not negligible. The US-China trade deal reached in mid-May, after weeks of hostile public rhetoric, showed that two countries can move quickly from confrontation to agreement when incentives align.

Yet a tariff negotiation and a nuclear standoff are not structurally equivalent. Tehran’s refusal to export its enriched uranium isn’t principally a bargaining chip — it’s a conclusion drawn from lived experience. The country signed the JCPOA in 2015, received partial sanctions relief, and watched Washington withdraw from the agreement three years later without compensation. Giving up its nuclear deterrent a second time, without a legally binding guarantee of sanctions relief backed by institutional continuity the US political system doesn’t currently offer, is a calculation Iran’s leadership has little incentive to make. The 16% probability Polymarket assigns to a deal by May 31 is not zero. It is also not high enough to trade on.

A Probability-Weighted Price

There is a particular clarity to a market that has been through enough cycles of hope and disappointment to stop flinching. Energy traders in late May 2026 are not confused about the situation. They understand the deadlock with precision: a US demand for uranium transfer that Iran won’t accept, an Iranian demand for Hormuz tolls that Washington won’t accept, a Supreme Leader who has issued his position in writing, and a president whose verbal interventions have proven reliable mainly as triggers for short-term volatility.

Brent crude near $104 and WTI near $98 are not expressions of irrational fear. They are the market’s probability-weighted estimate of what a barrel of oil is worth across a distribution of outcomes in which the Strait of Hormuz opens by August in some scenarios, and doesn’t in others. The IEA’s strategic reserves will run out regardless. Summer demand will arrive regardless. And the diplomatic gap between Washington and Tehran, for all the positive signals from Muscat and Geneva, remains wider than any single week of talks has yet come close to bridging.

The cushion is thin. The risks are high. And July won’t wait for diplomacy.