Mykola Kalashnyk, the head of the Kyiv regional military administration, said four of the 15 injured were in critical condition and four people had died in attacks that "targeted ordinary settlements in the region: residential buildings, educational institutions, businesses, and critical infrastructure".

He said he had "information about 30 damaged sites".

Ukrainian President Volodymyr Zelensky said rescue and clearing up operations were underway "in the Kyiv, Sumy, Kharkiv, Dnipro, and Mykolaiv regions".

"The main target for the Russians was the energy infrastructure of the Kyiv region, but unfortunately, there were also direct hits on and damage to ordinary residential buildings, schools, and civilian businesses," he said.

The air force said Russia had launched 430 drones and 68 missiles, adding that air defence had intercepted 402 and 68 of them respectively.

Peace talks spearheaded by the United States aiming to halt more than four years of fighting have been derailed by the US-Israeli war with Iran.

Zelensky on Friday also expressed concern that the temporary easing of US sanctions on Russian oil would bring Moscow new revenue to finance its war effort.

Russia's invasion sparked the bloodiest war in Europe since World War II, forcing the displacement of millions and killing hundreds of thousands of soldiers and civilians on both sides.