One person died after a fire broke out at the Slavyansk oil refinery in Russia's Krasnodar region as a result of the launch of several drones at the enterprise from Ukraine, the regional administration said early on Sunday.
"The drones were neutralized, but a fire broke out as a result of the fall of one of the devices," the operational headquarters of the region said on the Telegram messaging app.
Russia's TASS state news agency reported that one worker of the refinery was injured as a result of the attack.
Russia accuses Ukraine of using "terrorist activities" to try to disrupt its three-day presidential election, concluding Sunday.