Russia said a Ukrainian drone barrage triggered power cuts in one of its border regions -- one of Kyiv's largest attacks of the war.

Kyiv has vowed to increase its strikes on Russian territory, in particularly on Russia's oil infrastructure, in what it sees as a legitimate response to Moscow's daily barrages of Ukrainian cities and its energy network that have at times cut off heating and power to millions.

Russia's defence ministry sad it had downed 251 Ukrainian drones overnight -- one of the highest daily tolls since Russia launched its offensive in February 2022.

In the Belgorod border region, thousands were left without electricity.

"Currently there is a partial blackout in 24 settlements, affecting 5,400 people," Belgorod Governor Vyacheslav Gladkov said on social media.

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