In Ukraine, a 66-year-old man and 64-year-old woman died after a private house was hit by a guided aerial bomb in the Zaporizhzhia region, officials said.
Two more people were killed in Kryvyi Rih, a city in Dnipropetrovsk.
Officials in Sumy, Donetsk and Kherson also reported one death in each region, including a 51-year-old killed in a drone strike in Sumy.
In Kyiv, air-raid sirens sounded four times overnight as the Ukrainian capital came under Russian attack. At least six people, including a child, were reportedly injured, Mayor Vitali Klitschko said.
Russia said its attacks on Kyiv on Saturday night targeted a FirePoint facility producing parts for Ukrainian Flamingo missiles and a factory making components for drones.
A book market in the city’s Pochayna district was damaged in the strikes. Burnt books could be seen lying on the ground, while firefighters continue to douse the flames.
Sixty-nine-year-old Valentina’s husband owned a market stall.
Looking through the rubble, she told the BBC: “All these books in the street were from my husband’s stall in the market – I recognise them on the floor.”
She added: “You never think that it will happen to you.”
Vinyl store owner Luba, 42, said she has lost 500,000 hryvnias (£8,262) worth of stock.
“This business was my baby – many of the vinyls destroyed were rare and irreplaceable,” she told the BBC. “I want Russia to disappear from this Earth.”