The State Emergency Service said the attack damaged a residential building, a shopping center and the surrounding area.
According to the agency, a jet-powered drone struck a nine-story residential building, sparking a fire on the first floor. Rescuers evacuated residents, and six people, including four children, were injured in the attack.
The strike also sparked a major fire at a shopping center. The State Emergency Service said Russian forces carried out repeated strikes while firefighters were working to extinguish the blaze.
One of the strikes destroyed an emergency service vehicle and damaged another.
The agency said the area surrounding a residential building was also hit, setting two vehicles on fire. Despite the continued threat of further attacks, rescuers are working to deal with the aftermath of the strikes and assist those affected, the agency added.
Overnight on July 17, Russian forces carried out five guided aerial bomb strikes on Sumy, hitting civilian infrastructure, including in the city center. One of the strikes damaged a multistory nonresidential building and shattered hundreds of windows in nearby buildings.