The drones, operated by the SBU and the Special Operations Forces, targeted the flare farm, two primary processing units, and two technological units at the Volgograd oil refinery, an SBU source said.

It came as Russia and Ukraine swapped 150 prisoners of war each and UK foreign secretary David Lammy met with Ukrainian president Volodymyr Zelensky in Kyiv.

Ukraine is believed to have launched a new drone attack on Russia, targeting a major oil depot in the southern Krasnodar region. Kyiv has stepped up its aerial attacks across Russian regions over the winter, as it seeks to disrupt fuel and ammunition supply lines to Putin's army in Ukraine.

A Ukrainian drone attack sparked a fire at an oil depot in Russia’s Krasnodar region, the area’s governor said Wednesday. The fire, which was later put out, happened in the village of Novominskaya. Krasnodar Governor Veniamin Kondratyev said debris from a destroyed drone caused the fire,

Heavy fighting continues as Russian and Ukrainian forces exchange intense strikes. Kyiv launched a series of drone attacks targeting Russian energy facilities, sparking a blaze at oil depots in Krasnodar.

Ukrainian forces have launched new drone strikes on Russia, targeting an oil depot in the southern Krasnodar region.