Ukraine's military said its drones struck four oil refineries, radar stations and other military objects in Russia in an attack in the early hours of Friday.
"Unmanned aerial vehicles attacked the Afipsky, Ilsky, Krasnodar, and Astrakhan oil refineries," the Ukrainian military said in a statement on the Telegram messaging app.
"Additionally, radar stations and electronic intelligence centers of the Russian invaders in the Bryansk region and the temporarily occupied Crimea were struck," the statement said.
The Ukrainian military also struck drone storage and preparation sites in Russia's Krasnodar region.