The United States has told France and Germany to release 120 million barrels of diesel from reserves or face an export ban. Here is what it means.

Washington wants the fuel sent to Europe over six months to guard against a Russian energy cutoff. Diesel prices in the US hit a record $6.39 a gallon this week.

If Europe releases its stocks, supply rises and prices may cool. If it refuses, a US export ban could tighten global diesel markets.

The move comes weeks before the November midterm elections. Germany is reviewing the request.

France has not responded publicly. For ordinary people, the outcome could affect fuel and heating costs this winter.

Analysts say the ultimatum tests the US-Europe alliance.

The US wants France and Germany to release 120 million barrels over six months. US diesel hit a record $6.39 a gallon this week, per AAA. A release could cool prices; a refusal risks an export ban. The row comes weeks before the November midterms. Germany is reviewing the request.