Russia's Defense Ministry says four Ukrainian drones were intercepted and destroyed over the territory of the Rostov, Tula, and Kaluga regions.
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Kaluga Governor Vladislav Shapsha said one drone exploded above a pumping station in Kaluga, damaging the building but causing no fire.
Russia's Emergencies Ministry also said that two large-scale fires broke out in the Moscow region.
It said rescue workers were at work in the village of Obukhovo near Moscow, where a production facility and an administrative building were burning.
The ministry said there were no casualties.
Meanwhile, a Russian missile strike on a hotel in downtown Kharkiv, Ukraine's second-largest city, has injured 11 people, including Turkish journalists staying at the hotel, regional Governor Oleh Synyehubov said early on January 11.
Synyehubov said that one of those injured was in serious condition.
More than 30 civilians were inside the hotel at the time of the attack, Synyehubov said on Telegram.
Ukraine's emergency services said those hurt in the strike were "hotel staff and guests, one of whom is a foreign journalist," without giving details.
Kharkiv Mayor Ihor Terekhov said no military personnel were staying at the hotel.