Russia struck Ukraine's second-largest city of Kharkiv with drones overnight on May 21, injuring four civilians.
Kharkiv Oblast Governor Oleh Syniehubov said three of the victims were treated on the scene.
At around 2:00 a.m. local time, drone debris fell on two private homes, causing a fire. Three people were injured, including a 61-year-old man, a 69-year-old woman, and a 72-year-old woman.
Later on in the morning, a 53-year-old man was injured after a missile struck transportation infrastructure in the city.
A minibus was also reportedly destroyed.
Emergency workers have been dispatched to the sites of attacks.
Over 10,500 civilians in Kharkiv Oblast had been evacuated from their homes amid heavy fighting in the region, according to Governor Oleh Syniehubov.
Russia launched a new offensive on May 10 in northern Kharkiv Oblast. According to President Volodymyr Zelensky, Moscow's forces had managed to advance as far as 10 kilometers (6 miles) in the region but had been halted by the first line of defense.
Russia's offensive in Kharkiv Oblast in mid-May could be the first of several waves, and Russian forces may target the regional capital, Kharkiv, Zelensky said in an interview with AFP on May 17.