Four people, including a 16-year-old, died in a Russian glide bomb attack on the eastern Ukrainian city of Kramatorsk, regional prosecutors reported on Saturday.
Two others were injured in the attack early on Friday evening.
Overnight Russian drone attacks on the north-eastern Ukrainian city of Sumy injured at least 11 people, police in the region reported.
Kiev Mayor Vitali Klitschko said that falling drone fragments had set fire to an office building in the capital.
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The Ukrainian Air Force reported warding off 260 of 286 drones launched by Russian forces overnight. Eleven hits were reported.
On the Russian side, Rostov Governor Yury Slyusar reported one person killed and four injured in Taganrog, a city in the region. The city on the Sea of Azov is home to an aircraft plant and two factories making drones.
Ukraine has been warding off a full-scale Russian invasion since February 2022.
Damage from a Ukrainian military strike is seen in the village of Vasilyevka. Alexander Polegenko/TASS via ZUMA Press/dpa
A car is seen burning at the site of an airstrike on Kramatorsk. Natasha Rudenko/ZUMA Press Wire/dpa