A Russian aerial bombardment that lasted more than 12 hours has killed at least four people and injured at least 70 others in Ukraine.

President Volodymyr Zelensky said the deaths all occurred in the capital, Kyiv, where many of the projectiles were aimed, and the victims included a 12-year-old girl.

The barrage - involving nearly 600 drones and several dozen missiles aimed at seven regions of Ukraine - is one of the heaviest in recent months.

Zelensky warned that Ukraine would retaliate and said the "vile" attack showed Moscow "wants to continue fighting and killing". Russia said it struck military facilities and industrial enterprises supporting Ukraine's armed forces.