"The Saratov Oil Refinery is one of the key facilities in Russia's fuel infrastructure. Its refining capacity reaches 7 million tons of oil annually," Andrii Kovalenko, head of Ukraine's Center for Countering Disinformation,

The attack on the major oil refinery is an attempt by Ukraine to disrupt the Russian military's ability to resupply frontline troops.

Ukraine often claims its drone attacks into Russia aim to destroy important infrastructure for Moscow's war effort.

A Ukrainian drone attack overnight sparked a fire at an oil depot in Russia's southern region of Krasnodar that has since been extinguished, regional officials said on Wednesday.

Ukraine has launched its second major drone attack in a week against Russian oil refineries hundreds of miles from its borders.

Recent social media videos show Ukrainian forces using drones similar to IEDs. The drones sit next to roads and then strike Russian military vehicles when they pass.

Ukrainian natural gas production facilities were damaged in a Russian attack on Ukraine's central Poltava region overnight, the state-run oil and gas firm Naftogaz and Energy Minister German Galushchenko said on Tuesday.

Ukrainians conducted another successful attack on Russian fuel infrastructure. On Tuesday morning, drones attacked a refinery in Saratov. A series of explosions were also heard near an airbase close to the city of Engels.