local time, after which a large fire was seen on the facility's territory.The Voronezh Oblast refinery was also presumably hit, the sources confirmed, without elaborating on the consequences.The Russian Defense Ministry claimed its forces downed six Ukrainian drones overnight: three over Voronezh Oblast, one over Ryazan Oblast, one over Belgorod Oblast, and one over Kursk Oblast.Ukrainian forces have recently launched a series of drone strikes aimed at damaging Russia's oil industry. Attacks against oil depots in Russia's Smolensk Oblast last week destroyed 26,000 cubic meters of fuel, security sources told the Kyiv Independent.The Ryazan Oil Refinery, the largest plant operated by Rosneft, was reportedly also targeted on March 13.Ukrainian drones hit one Russian oil refinery after anotherUkraine faces a challenging problem: how to stop a resurgent Moscow in its tracks long enough to rotate the troops, resupply, and fortify.

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