A fire broke out late on January 17 at an industrial site in Russia's Kaluga region south of Moscow after it was hit by drones.
Unverified videos posted on social media showed firefighting vehicles speeding off in the direction of a large blaze at what they said was an oil storage depot in Lyudinovo.
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Kaluga Governor Vladislav Shapsha said on Telegram that the fire had broken out at an industrial site after a drone strike.
Shapsha said seven drones had been downed and one landed in a "nonresidential area." The fire has been brought under control and no casualties were reported, he said.
Ukraine's military said on January 16 that at least three drones had hit an oil depot in Russia's southern Voronezh region, setting that facility ablaze.
Russian officials reported other drone attacks on January 17. The Defense Ministry and the governor of the border region of Bryansk reported that air defense units had destroyed nine Ukrainian drones over the region.
The governor of the Smolensk region, which borders Belarus, said air defenses had downed five Ukrainian drones. No casualties were reported in either strike.
The Ukrainian military said its air defenses had downed 33 of 50 drones launched by Russia on January 17. The worst attack was a missile strike on the central city of Kryviy Rih, President Volodymyr Zelenskiy's hometown.
Four people were killed and 14 others were wounded in the strike, which partially destroyed an educational facility.
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Serhiy Lysak, head of the Dnipropetrovsk Regional Military Administration, said that of those injured on January 17, four were hospitalized and in a serious condition.
Witnesses said explosions from the attack could be heard throughout the city, while Lysak said two multistory buildings, one of which caught fire, were damaged.
Zelenskiy said in his evening address that the deaths and injuries would not have happened if Ukraine had received the air defense systems it has "long been discussing" with its partners.
The attack appears to have again targeted civilian infrastructure. Russia has denied intentionally hitting civilian sites despite numerous attacks on such installations.
The strike on Kryviy Rih came a day after Moscow said Kyiv launched six U.S.-made ATACMS missiles at Russia's Belgorod region. Officials had pledged to retaliate for that attack and any others that involve longer-range Western-supplied missiles.