At least seven people have been wounded in a wave of Ukrainian airstrikes on the Rostov region in southern Russia, local authorities said on Saturday.
Two children were taken to hospital, one with very serious injuries, state news agency TASS reported, citing Governor Yuri Slyusar. Two residential blocks in the port city of Rostov-on-Don were damaged by falling drone debris, according to the report.
Ukrainian media reported that a warehouse belonging to an electronics retailer also caught fire.
The reports could not be independently verified.
For weeks, Ukrainian forces have repeatedly targeted the logistics centres of major Russian companies. Online retailers Wildberries and Ozon have been among the main targets.
The strikes have caused damage running into the billions and have brought renewed attention to the consequences of Russia's war on its neighbour. Kiev's leadership is also seeking to influence the political mood in Russia ahead of parliamentary elections scheduled for September 18 to 20.
Ukraine has been defending itself against Russia's destructive war for four and a half years with the help of Western military aid. Both sides deploy vast numbers of drones in their mutual strikes, as the weapons are relatively cheap to produce and difficult to intercept when deployed in large numbers.
During some attack waves, hundreds of drones are used simultaneously to overwhelm air defences. Both sides accuse each other of deliberately targeting civilians, though casualties and damage on the Ukrainian side are far greater.