Trump Blames Ukraine — But Diesel Prices Soared Immediately After the Iran War Began

Diesel prices in the United States have surged by approximately 65% since late February 2026. But who bears responsibility for this extraordinary price shock?

US President Donald Trump has increasingly pointed to Ukraine as a contributor to high fuel prices, particularly criticising Ukrainian attacks on Russian oil refineries.

However, a closer examination of official data from the US Energy Information Administration (EIA) reveals a striking timeline.

When did diesel prices start soaring?

On February 23, 2026, just five days before the US-Israeli military strikes against Iran began, the average US diesel price stood at $3.809 per gallon.

The war began on February 28.

By March 9, diesel had already reached $4.859 per gallon — an increase of approximately 28% in just two weeks.

On March 16, the price climbed to $5.071.

By April 6, diesel had risen further to approximately $5.64 per gallon.

On September 21, the national average reached $6.529 per gallon.

As of October 19, the average price remained at $6.276.

That represents a 64.8% increase compared with the last weekly reading before the war began.

What triggered the price shock?

The Strait of Hormuz is one of the world's most important energy transportation routes. Under normal conditions, oil shipments through the strait account for approximately 20% of global petroleum consumption.

The war involving the United States, Israel and Iran severely disrupted energy supplies across the region.

Attacks on energy infrastructure, production outages, threats to commercial shipping, and rising insurance and transportation costs placed enormous pressure on international oil markets.

The US Energy Information Administration and international market analysts have identified disruptions to Middle Eastern energy supplies as a major driver of the initial price surge.

Even the United States, one of the world's largest oil producers, cannot escape the effects of global energy market disruptions.

What role does Ukraine play?

Ukrainian drone strikes against Russian oil refineries have also disrupted the supply of petroleum products.

That is a legitimate economic factor and should not be ignored.

But the crucial question is:

Can those attacks explain a diesel price explosion that began immediately after the Iran war started?

The timeline does not support such a one-sided explanation.

The first dramatic increase in American diesel prices occurred in early March, following the outbreak of the war with Iran.

Ukrainian attacks on Russian refineries were not the sole cause of that initial shock.

In October, President Trump increasingly criticized Ukraine's strikes against Russian energy infrastructure, suggesting they were contributing to high international fuel prices.

Those attacks may indeed have intensified supply shortages.

However, they cannot adequately explain the entire increase in diesel prices since February.

So who bears responsibility?

It is essential to distinguish between political responsibility and economic causation.

The US and Israeli governments bear responsibility for their decision to launch military strikes against Iran on February 28.

Iran bears responsibility for its own military responses, including actions that disrupted energy infrastructure and international shipping.

Ukraine's strikes against Russian refineries represent an additional factor. They must also be understood in the context of Russia's ongoing invasion of Ukraine, which began in 2022.

Attributing the entire diesel price increase to a single actor would therefore be misleading.

Nevertheless, the initial and most dramatic price shock followed the outbreak of the Iran war. That is what the official US energy data show.

The timing alone does not establish the precise contribution of every military action. However, the documented disruptions to Middle Eastern oil supplies provide substantial evidence of the war's central role in the initial price surge.

American farmers are paying the price

For US farmers, transportation companies and the food industry, this is far more than a geopolitical debate.

Diesel powers agricultural machinery, planting and harvesting operations, and the transportation of agricultural commodities.

Consider a farming operation consuming 10,000 gallons of diesel.

At the national average retail prices recorded on February 23 and October 19, purchasing that amount of diesel would cost approximately $24,670 more in October than before the war.

Actual farm-level costs depend on regional prices, fuel contracts and applicable taxes.

Higher fuel expenses also increase pressure on transportation costs for wheat, corn, soybeans, sugar and other agricultural commodities.

These effects extend beyond the United States, influencing international agricultural supply chains and potentially affecting the competitiveness of American agricultural exports.

My conclusion

Political accusations must be measured against verifiable facts.

The official US energy data establish when the dramatic diesel price increase began: immediately after the outbreak of the war involving the United States, Israel and Iran.

Disruptions to Russian refining capacity, Ukrainian strikes and broader constraints on global petroleum supplies have added further pressure.

Anyone discussing responsibility for today's exceptionally high diesel prices must acknowledge the Iran war and its consequences for international energy markets.

Blaming Ukraine without addressing the initial price shock and the disruption of Middle Eastern energy supplies presents an incomplete picture.

For farmers, commodity traders and the global food industry, economic facts matter more than political blame.

Sources: US Energy Information Administration (EIA), Weekly On-Highway Diesel Prices; Reuters reporting, October 5, 16, 20 and 21, 2026.