Iran or Ukraine? BBC Verify Reveals Which War Is Really Driving Up Diesel Prices

The diesel crisis has a new villain, and according to BBC Verify, it is not the one the White House keeps naming. As record fuel prices bite from Ohio to Oxfordshire, the BBC's fact-checking unit has weighed the two wars disrupting the world's diesel supply — the conflict engulfing Iran and the Gulf, and Ukraine's drone campaign against Russian refineries — and found that one of them is doing noticeably more damage than the other.

The verdict matters because diesel is the workhorse fuel of the global economy. It moves trucks, trains, farm machinery and construction equipment, and in colder months it heats homes. When diesel prices double, the pain spreads well beyond the forecourt into food prices, manufacturing costs and inflation figures that central banks watch closely.

The blame game at the pump

Donald Trump has made no secret of where he thinks the problem lies. The president has repeatedly blamed Ukraine's strikes on Russian refineries for the squeeze American drivers are feeling, even as his administration wages war alongside Israel against Iran. It is a politically convenient framing: Kyiv's drone campaign against Russian energy sites is real and visible, while the disruption flowing from the wider Middle East conflict is harder to sum up in a soundbite.

The numbers tell a different story. US retail diesel stood at $6.20 a gallon on 5 October, according to the data examined by BBC Verify, compared with roughly $3.50 before the Iran war began — a jump of more than 75 per cent. UK drivers have fared no better: diesel prices have touched record highs in Britain, and European diesel futures have more than doubled since the start of 2026. Reuters reporting in September described the surge as one of the sharpest fuel shocks in living memory, driven by wars in Iran and Ukraine cutting exports from Russia, Saudi Arabia and the United Arab Emirates. For readers following the policy response, Verity earlier covered the G7's emergency release of oil and diesel stocks as governments scrambled for short-term relief.

What the export numbers actually show

BBC Verify's core finding rests on trade data. Global diesel exports fell from 6.8 million barrels a day to 5.8 million barrels a day in September 2026 — a loss of one million barrels of daily supply from world markets. That missing million is the gap between what the world normally burns and what it can currently buy, and it explains why refineries almost everywhere are running flat out.

Breaking the shortfall down is where the argument gets settled. Russia's diesel exports fell by roughly 670,000 barrels a day after Ukrainian strikes damaged refineries and Moscow imposed its own export restrictions in July. The Gulf states, by contrast, lost about 810,000 barrels a day as the Iran conflict disrupted shipping through the Strait of Hormuz and damaged Middle Eastern refining capacity. On those figures, the Middle East shock is the larger of the two — and it is not close.

The International Energy Agency has warned that the world's remaining refineries have almost no slack left to compensate, saying many are already stretched to capacity — leaving few options to prevent tighter supplies and higher prices in the coming months. In the United States, refineries were operating at their highest level in eight years in late August — and it still was not enough.

The Iran factor: Hormuz and the Gulf shortfall

The Strait of Hormuz is the narrow waterway through which a large share of the world's oil and refined products must pass, and it has become the chokepoint of this crisis. Shipping data from Kpler showed Middle East diesel exports halving between March and August compared with a year earlier, averaging just 800,000 barrels a day. The Middle East supplied nearly 41 per cent of Europe's diesel imports in 2025 — so when Gulf shipments collapse, European drivers feel it first.

Oil refinery silhouetted against a foggy blue evening sky Credit: W.carter / Wikimedia Commons, CC BY-SA 4.0

Disruption has also spread to the Red Sea, where Saudi Arabia loads much of its diesel, adding insurance costs, longer voyages and yet more friction to every barrel that does get through. The result is a market where the physical fuel simply is not where it needs to be, whatever the headline crude price happens to be doing. Analysts note that crude flows through Hormuz have partly recovered, but refined-product shipments remain a fraction of pre-war levels — which is why diesel stayed expensive even when crude eased.

For Europe, the arithmetic is unforgiving. The continent was already structurally short of diesel before either conflict began, importing heavily from both Russia and the Gulf. Losing chunks of both suppliers at once has turned a tight market into a genuine shortage.

The Ukraine factor: strikes on Russian refineries

None of this lets the Ukraine war off the hook. Ukrainian drone strikes have genuinely crippled Russian refining: Russia banned diesel exports in July as the attacks cut production, with reports that output at some of the country's largest diesel-producing facilities has plunged and at least one major plant shut entirely. Russia is the world's second-largest diesel exporter, supplying about 783,400 barrels a day to global markets, so any sustained damage there moves world prices.

But BBC Verify's comparison shows the Russian shortfall is the smaller half of the story. Ukraine's campaign has cost the market roughly 670,000 barrels a day of diesel exports — significant, but still less than the 810,000 barrels a day lost from the Gulf. Russia is the world's second-largest diesel exporter, so the damage matters — but the president's claim that Kyiv's strikes are the main driver of American fuel pain does not survive contact with the export data. The wider war in Ukraine continues to reshape energy flows, but on diesel specifically, the evidence points elsewhere.

Trump's Russian diesel deal — and why analysts doubt it

Faced with record prices and midterm elections approaching, Trump has reached for an extraordinary lever: buying diesel from Russia. After a call with Vladimir Putin, the president announced that Russia would "immediately" supply more than 300,000 tonnes of diesel — about 2.25 million barrels — followed by 500,000 tonnes in November, another million tonnes after that, and a further three million tonnes "within a short period of time". The US Treasury's sanctions office duly issued a licence permitting imports of Russian-origin diesel into the United States until April 2027.

The announcement drew swift condemnation from Kyiv. Volodymyr Zelenskyy said allowing Russia to sell petroleum products "is an investment in war that needs to end, not continue", while Senate Democrats expressed dismay at the carve-out from sanctions policy. Trump himself framed it as a triumph of dealmaking, writing that with US "control" of Hormuz and the Russian announcement, diesel prices would be "coming, in record numbers down, and fast".

Market analysts are unconvinced. The pledged volumes amount to a fraction of one per cent of global daily diesel demand of roughly 29 million barrels. More importantly, experts describe the deal as a redirection of existing flows rather than new supply: if Russian barrels sail to America, Russia's current buyers must source their fuel elsewhere, leaving the global balance broadly unchanged. Moscow's own refineries, battered by Ukrainian strikes, may struggle to deliver the promised volumes at all — Russian diesel exports have already nearly halved this year.

The political backdrop is hard to ignore. With midterms approaching and Republicans walking a tightrope, the White House needs visible action on fuel costs. The Russian diesel deal provides that — whether or not it moves the price at the pump.

What happens next for drivers and the economy

The honest answer is that relief is likely to be slow. The IEA expects the refining crunch to persist for months, with agricultural harvest season sustaining demand and winter heating needs looming in the northern hemisphere. US distillate inventories remain roughly 15 per cent below their five-year average, and European stocks at the Amsterdam-Rotterdam-Antwerp hub are at their lowest seasonal level in years.

For businesses that run on diesel — hauliers, farmers, construction firms — the cost squeeze feeds directly into the prices consumers pay for food and goods, which is why economists are watching this crisis as a potential inflation accelerant. Read more of our business coverage for ongoing analysis, or visit our homepage for the latest headlines. You can also read more about who we are and how Verity reports energy markets.

The BBC Verify verdict, in the end, is a reminder of how narratives and numbers can diverge. Blaming Ukraine is simple. The data says the bigger hole in the world's diesel supply was blown in the Gulf.