Ukraine's President Volodymyr Zelenskyy said the attacks were justified as "responses to Russia's prolongation of the war and its attacks on our cities and communities", two days after Russian strikes on Kyiv killed 24.

President Volodymyr Zelensky says 15 civilians killed in 1,567 drone strikes over two days.

A huge wave of almost 600 Ukrainian drones attacked Russia overnight, killing three people in the Moscow region and one in the Belgorod region, authorities said on Sunday.