Ukrainian drones killed at least six people overnight in a wave of strikes on Russia that also hit a warehouse owned by online retailer Ozon and an industrial facility in the Samara region, regional officials said Saturday.

In a post on Telegram, Samara region Governor Vyacheslav Fedorishchev said that several people were wounded in the strikes. He did not name the industrial facility that was targeted, but Ukraine's military said it struck the Novokuibyshevsk refinery, causing a fire.

Ozon, Russia's second-largest online retailer, said in a statement on Telegram that work at its Samara region logistics center in the town of Chapayevsk had been halted after the strike, which it said caused injuries.

The strike is the first on Ozon, after weeks of drone attacks on its larger rival Wildberries, which Ukraine has cast as part of a wider campaign against economic infrastructure underpinning Russia's war.

Elsewhere, in the southern Krasnodar region, Governor Veniamin Kondratyev said that two children had been killed and two adults wounded in a strike on the Sea of Azov port town of Yeysk. He said a fire had broken out at an unnamed facility at the town's port.