The world is not running out of crude. It is running short of the fuels made from it. Russia is preparing to extend its ban on most diesel exports beyond the end of September as Ukrainian attacks continue to damage its refining system. Before the restrictions, Russia supplied roughly 10% of global seaborne diesel. Those barrels are disappearing just as Middle Eastern disruptions are removing more. The result is increasingly visible in the price that matters. Not Brent. Diesel. In Europe, the premium of diesel over crude has risen to roughly $84 a barrel, compared with around $28 at the end of February. That is a threefold increase in the refining margin. And it tells us something the oil price alone does not. The global energy shock is changing shape. For most of the past year, investors have focused on crude production, Hormuz, OPEC capacity and whether the world has enough barrels. But crude is only useful once it has been refined into something the economy can consume. Diesel moves trucks. It runs agricultural machinery. It powers construction equipment. It feeds mining operations. It heats homes. It moves food. And increasingly, it is where geopolitical disruption is being concentrated.

Russia illustrates the problem perfectly. Ukraine does not need to destroy Russian oil production to damage global fuel supply. It can attack refineries. That leaves crude underground, or still in production, while reducing the amount of diesel, gasoline, and jet fuel that reaches the market. The distinction matters enormously. A damaged oil field reduces crude supply. A damaged refinery reduces the system’s overall conversion capacity. That is much harder to replace quickly.

Russia initially introduced its diesel export ban in July for a few weeks. Then it extended it through August. Then September. Now another extension is being prepared. Temporary disruption is becoming structural. At the same time, Middle Eastern supply has deteriorated. Hormuz remains constrained. Saudi export infrastructure has been attacked. Red Sea shipping has become more dangerous. Refined-product flows from the region have fallen. Bloomberg estimates suggest that the Middle East conflict has already removed more diesel from the global market than the Russia-Ukraine war.

The two shocks are therefore no longer separate. They are reinforcing each other. Russia removes refined products from the west. The Middle East removes them from the east. Europe sits in between. That explains why diesel can trade with an $84 premium even when crude itself is far from historical extremes. The market is not paying for oil. It is paying for conversion and delivery. This has important consequences for inflation.

Central banks traditionally look through temporary oil movements because energy prices are volatile. Diesel is more difficult to ignore. Higher diesel prices enter the economy repeatedly. That is why the current shock can migrate from headline inflation into core inflation even if crude prices eventually stabilise. If diesel remains structurally expensive, central banks will face the same problem repeatedly: inflation generated by supply constraints that monetary policy cannot repair. Higher rates cannot rebuild a Russian refinery. They cannot reopen Hormuz. They can only destroy enough demand to compensate for what the energy system cannot supply. That is a brutal adjustment mechanism. It also means investors may be watching the wrong benchmark. Brent remains the headline. But the more relevant signal for the global economy may increasingly be the crack spread, the difference between crude and the refined fuels produced from it.

If that spread stays near current levels, crude could fall, and inflation could persist. That would be the dangerous scenario. Markets celebrate lower oil. Central banks discover that transport and industrial costs are still rising. Consumers see no relief. And governments face renewed pressure to intervene. The next phase of the energy crisis may therefore look very different from the last one. The question will not be whether the world has enough oil. It will be whether it has enough refineries, enough secure shipping routes and enough diesel arriving where the economy needs it. The barrel is still there. Increasingly, the fuel is not.