Russian overnight strikes on Kherson, in southern Ukraine, killed two and injured two others.

Ukrainian drone strikes on Russia's Novorossiysk, Black Sea coastal city, killed two people and injured eight, including an eight-year-old child, the regional governor said on Wednesday after the latest exchange of air attacks between the warring countries.

Ukraine has increased its strikes on Russia in what it says is fair retribution for Moscow's own daily strikes on Ukrainian cities that force people into shelters and kill civilians across the country.

Russia's Krasnodar — a southern region home to several tourist hotspots — saw a barrage of "several hundred" Ukrainian drones, regional governor Venyamin Kondratyev said.

"An eight-year-old child died in Novorossiysk... Eight people, including one child, were also wounded and have been hospitalised," Kondratyev said on Telegram.