MOSCOW, Russia (AFP) — A drone has attacked an airfield in Russia's Kursk region bordering Ukraine, the local governor said Tuesday, a day after Moscow blamed Ukraine for drone strikes at two other Russian airfields.

"As a result of a drone attack in the area of the Kursk airfield, an oil storage tank caught fire. There were no casualties," governor Roman Starovoyt said on social media, adding that they were trying to contain the fire.

Starovoyt did not specify where the drone originated.

On Monday, Russia's defense ministry said Ukraine "attempted to strike" the Dyagilevo airfield in the Ryazan region and the Engels airfield in the Saratov region with "Soviet-made drones."

The drones were intercepted but debris fell and exploded on the airfields, the ministry added.

It said that three soldiers had been killed and four others injured.

Power restoration

In Ukraine, workers try to restore power on Tuesday after Russia's latest wave of missile strikes caused power disruptions across the country, right as winter frost builds and temperatures plunge.

Out of the 70 missiles launched by Moscow, "most" were shot down, President Volodymyr Zelensky said, but the barrage still hit Ukraine's already battered infrastructure.

Fresh power cuts were announced in all regions "due to the consequences of shelling," national electricity provider Ukrenergo said on Telegram.

The head of Ukrenergo said he had "no doubt that Russian military consulted with Russian power engineers during this attack," judging by where the missiles landed.

"The time that Russians chose for this attack was connected with their desire to inflict as much damage as possible," Volodymyr Kudrytskyi told a Ukrainian news program, explaining the attacks were launched as the country enters a "peak frost" period.

"Our repairmen will be working on the energy system restoration."

Nearly half of Ukraine's energy system has already been damaged after months of strikes on power infrastructure, leaving people in the cold and dark for hours at a time as outdoor temperatures drop below zero degrees Celsius.

As missiles rained down on Kyiv, United Nations rights chief Volker Turk — who arrived over the weekend on a four-day visit — had to move his meetings with activists into an underground shelter.

Zelensky announced in his nightly address that four were killed in Russia's strikes.