Drones targeted the Russian city of Ust-Labinsk in the Krasnodar Krai, with Russia's Astra news outlet reporting a fire at the site of the strike on June 6.
Local authorities have not yet commented on the reported attack.
Meanwhile, the Telegram channel Exilenova+ reported that drones struck a local oil depot.
On May 30, Ukraine's Security Service (SBU) struck the Armavir oil depot in Russia's Krasnodar Krai. A fire was reported at the site following the attack.
On May 27, Ukraine's Defense Forces struck the Tuapse oil refinery in Russia's Krasnodar Krai. A fire and heavy smoke were reported on the facility's grounds.
It was at least the fifth reported attack on the refinery this spring. Overnight into May 27, residents of Tuapse reported explosions. Footage captured by Astra readers showed the moments of the attack. An OSINT analysis suggested the refinery was once again the likely target.