This comes despite the US publicly telling the Ukrainians to stop attacking Russian refineries for fear Brent crude prices could spike and worsen the inflation storm in the US ahead of the presidential elections in the fall. 

Bloomberg reports an oil refinery in the Sloviansk-on-Kuban region was hit by a swarm of Ukranian suicide drones on Saturday morning. 

State-run news agency Tass said the refinery strike caused damage and a fire, partially suspending operations at the crude processing facility.  

"The work of the (Slavyansk) plant has been partially suspended. Exactly 10 UAVs (drones) flew directly into the plant, there was a strong fire. There may be hidden damage," Eduard Trudnev, the security director at Slavyansk ECO Group, which operates the plant, was cited as saying by TASS.

On Telegram, Roman Siniagovskyi, a local government official in Slavyansk, said drones struck a distillation tower and storage tank. 

Berg continued, 

"The Ukrainians have been hitting refineries, not Russian crude oil production or export facilities. This causes problems for Russia's domestic market for refined products, but for the rest of the world, a decline in Russia's exports of products will be compensated for by increased exports of crude oil." 

Meanwhile, Biden's top officials have pleaded with Kyiv to stop attacks on Russia's energy infrastructure because of the fears that turmoil in crude markets would send pump prices in the US higher ahead of the presidential elections in November.