More than 120 firefighters were trying to extinguish a blaze at an oil depot in the Russian city of Sochi that was sparked by a Ukrainian drone attack, regional Governor Veniamin Kondratyev said early on Sunday on the Telegram messaging app.

A drone strike resulted in a major fire early on Aug. 3 at an oil depot in Russia’s resort city of Sochi, setting ablaze a 2,000-cubic-meter fuel tank, local authorities said.

Russia’s drone and missile attacks on Ukraine escalated to record levels in July, reflecting a rapidly expanding domestic production capacity. -This surge, built on Iranian Shahed technology, aims to achieve an unprecedented ability to launch thousands of drones at once.