A Russian drone attack damaged power infrastructure in several Ukrainian regions overnight, Ukraine's energy ministry said on Thursday.
The ministry said a "significant number" of households in the Volyn and Odesa regions - in northwestern and southwestern Ukraine, respectively - were disconnected from power supplies by the strike, as well as some in the Chernihiv region north of the capital Kyiv.
The governor of Volyn said more than 103,000 households in that region had lost power as a result of the attack. Volyn region is several hundred kilometers from the front line and borders NATO member Poland.
Meanwhile, the Ilskiy oil refinery in Russia's southern Krasnodar region was hit by debris from a Ukrainian drone, causing a fire which had been put out overnight, local authorities said on Thursday.
Ukrainian drones also struck an energy storage facility in the Russian city of Almetyevsk, causing a fire that has since been extinguished, Russian media cited the press service of the local governor as saying.
Almetyevsk is located around 1,700 km from Ukrainian-held territory, in the oil-rich Volga river region of Tatarstan.
Kyiv has since August stepped up drone attacks on Russia's energy infrastructure in an effort to squeeze Moscow's ability to finance its military campaign in Ukraine.
The Russian-installed governor of Ukraine's southern Kherson region accused Ukraine on Thursday of killing at least 24 people, including a child, in a drone strike on a hotel and cafe where New Year celebrations were being held.
The governor, Vladimir Saldo, made the allegation in a statement on the Telegram messaging service. A local pro-Russian news outlet published pictures of a badly damaged building, where it said the strike took place.
Ukraine's military did not immediately respond to an emailed request for comment. Reuters was not able to immediately verify the images or the allegation.