drones to destroy at least six military aircraft and badly damage eight others at an airfield in Russia's Rostov region, while Russian defense officials claimed they intercepted 44 Ukrainian drones and that only a power substation was damaged in the attack.
The assault appeared to be one of Kyiv's biggest air attacks in the war, coming as its forces step up their assaults on Russian soil. The Associated Press could not independently verify either side's claims.
Russia has escalated attacks on civilian infrastructure, including Ukraine's power plants, in recent weeks, signaling a new and potentially dangerous phase in the conflict as both sides struggle to achieve significant advances on the ground.
The overnight attack targeted a military airfield near Morozovsk in Russia and was conducted by Ukraine's Security Service in cooperation with the army, Ukrainian intelligence officials told the AP.
They said around 20 members of the airfield's personnel were killed or injured. Morozovsk airfield was used by Russian bombers that have been launching guided aerial bombs at Ukraine's cities and frontline positions, the officials said.
They spoke on anonymity because they were not authorized to publicly discuss the operation.
If true, the attack would be among Ukraine's most successful cross-border strikes. Last October, Ukraine claimed it destroyed nine Russian helicopters at two airfields in Russian-occupied regions using longe-range ballistic missiles donated by the United States.
Last August, Ukrainian media,