KYIV, Ukraine (AP) — U.S. President Donald Trump on Sunday called on Ukrainian President Volodymyr Zelenskyy to halt strikes on Russian oil refineries and other infrastructure used to produce and distribute diesel, saying the attacks are causing a global shortage. He spoke after diesel prices in the U.S. hit a record on Friday, soaring past $6 a gallon on average.

Ukraine has for months been targeting Russia’s oil and gas industry with long-range strikes, prompting fuel rationing across the country and causing Moscow to ban diesel exports in July, removing supplies from the already tight global market.

But the global crunch also came after the war on Iran curtailed oil shipments through the Strait of Hormuz.

Fuel prices are weighing on Americans as they prepare to vote in midterm elections in November.

Trump was asked by a reporter if he had spoken with Zelenskyy following his recent conversation with Russia’s Vladimir Putin. He responded by calling on Zelenskyy to halt strikes against Russia.

“Mr. Zelenskyy has to do one thing. He has to stop knocking out diesel fuel in Russia,” Trump told reporters on the sidelines of the Irish Open, which is being played at his Doonbeg golf club.

“We spoke to Mr. Zelenskyy about it. There are plenty of other targets. Don’t hit diesel fuel, because that’s hurting, that’s hurting the world,” he said.

Diesel exports from Gulf countries way down since Iran war began

According to a report published Friday by the International Energy Agency, net exports of diesel and gasoil from the Gulf countries in August stood at “just over a quarter” of what they were before the war on Iran began in February.

“Disruptions to Russia’s refining system and a near-halt to product exports following intensified Ukrainian attacks have compounded these losses,” the IEA wrote. It added that in February, combined next exports of diesel and gasoil from the Gulf and Russia “accounted for almost 45% of global seaborne trade.”

Kyiv says Russia’s oil industry both funds and directly fuels Moscow’s more than four-year-old invasion of Ukraine.

Russia has ramped up its air campaign against Ukraine in recent weeks, using ballistic missiles and jet-powered drones to pierce Ukraine’s defenses. Moscow’s attacks have targeted Ukraine’s power grid ahead of winter in what officials say is meant to demoralize civilians.

Civilians were killed and injured overnight into Sunday as Russia and Ukraine exchanged large-scale drone strikes.

Two people were killed and 14 more wounded near an oil and industrial hub in Russia’s Tatarstan, according to local officials, while Ukrainian authorities reported on Russian drones pummeling the Black Sea port of Odesa and starting a fire near a border crossing with Poland.