A Ukrainian drone strike caused a fire at an oil depot in Russia's southern Volgograd region on Saturday, regional authorities confirmed. There were no immediate reports of casualties, but nearby residents might be evacuated, the regional governor said on Telegram via the local administration channel, according to news agency AP. The post did not share how severe the damage was. Kyiv has said its long-range drone attacks on Russian energy sites aim to cut Moscow's oil export income, which it claims funds Russia's invasion. Russia has also attacked Ukrainian power and fuel facilities. This strike came one day after Russia launched a large-scale overnight assault on Ukraine, firing hundreds of drones and missiles, Ukrainian officials say. At least four people died in Kyiv, including an emergency medical worker, and dozens were hurt. For the second time in nearly four years of war, Russia used its nuclear-capable Oreshnik hypersonic missile in western Ukraine as a warning to NATO allies, according to AP. Russia's defense ministry stated on Saturday that their forces hit Ukrainian energy and fuel depots using aviation, drones, missiles, and artillery on Friday and overnight, without giving details on locations or damage. The Ukrainian air force said Russia launched 121 drones and one ballistic missile overnight into Saturday, and that 94 drones were shot down.