U.S. diesel prices broke another record last week, topping $6.50 per gallon. In Europe, fuel prices are soaring, and shortages are looming over already struggling economies. There is simply not enough refining capacity in the world to make up for the loss of Middle Eastern and Russian barrels. And there is no quick fix. Last week, Russia said it would extend a ban on diesel exports until the end of October, as Ukrainian drone attacks on refineries continued, despite President Donald Trump’s call on the Zelensky government to stop attacking…