The deputy head of the Office of the President of Ukraine, Kyrylo Tymoshenko, said on social media that the death toll from strikes on a residential building in Kyiv by a swarm of more than two dozen Russian "kamikaze drones" has risen to three, but 19 people have been rescued and the rescue work is ongoing.

Meanwhile, in the eastern region of Sumy, the regional governor said three people have been killed and several more injured. 

"At 5:20 (0220 GMT) in the morning, three Russian rockets hit a facility of civil infrastructure. At least three people died. Nine are injured. There are still people under the rubble," Sumy regional governor Dmytro Zhyvytsky said on social media. 

Ukrainian Prime Minister Denys Shmygal earlier said five strikes were recorded in Kyiv on Monday as well as attacks in the Dnipropetrovsk and Sumy regions, knocking out electricity to hundreds of towns and villages across the country.

Ukrainian Foreign Minister Dmytro Kuleba on Monday also called for a "strong ninth EU sanctions package on Russia" in wake of the Russian strikes. 

Russia's defense ministry on Monday confirmed it continued strikes at Ukraine's military command and control facilities and energy infrastructure.

(With input from AFP)