MOSCOW - Ukrainian drone attacks sparked fires at a Russian nuclear plant and other energy facilities, local authorities said Sunday.

Debris from a Ukrainian drone struck a transformer at the Kursk nuclear power plant early Sunday, causing a fire and damage, the regional operational headquarters said.

No casualties were reported, it said, adding that the blaze was extinguished and radiation levels at the plant and surrounding area remained unchanged.

ALSO READ: The best time to help end Russia-Ukraine conflict is now

In the Leningrad region, debris from another drone ignited a fire at a terminal of Russian natural gas producer Novatek in the port of Ust-Luga, regional governor Alexander Drozdenko said.

The fire was later put out and no casualties were reported, he said.

Meanwhile, Russia said  on Saturday that, over the past 24 hours, it shot down four Ukrainian guided aerial bombs and 160 drones. The Russian Defense Ministry said its air defense systems intercepted 33 Ukrainian drones over the country's western border regions.

"On-duty air defense systems downed 13 Ukrainian fixed-wing unmanned aerial vehicles, 12 over the Bryansk Region and one over the Kaluga Region" between 9:30 am and 12:00 pm Moscow Time (0630 - 0900 GMT), said the ministry.

READ MORE: Lavrov: Ukraine security talks without Russia 'road to nowhere'

It added that 20 more fixed-wing drones were destroyed within the following two hours -- eight over Bryansk, seven over Smolensk, three over Kursk and two over Kaluga.

The ministry also said that its forces have taken control of the settlements of Kleban-Byk and Sredneye (Serednje) in the Donetsk region.

"Thanks to the decisive operations carried out by units of the Southern Group of Forces, the settlement of Kleban-Byk in the Donetsk has been liberated," it said.

The Western Group of Forces also "freed the settlement of Sredneye (Serednje) in the Donetsk," it added.