In the wake of massive drone strikes on Kyiv, Ukraine launched air attacks on May 17 called the heaviest to hit the Moscow area in over a year. At least four people died, officials said on Sunday, in strikes on the Moscow and Belgorod regions.

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.

Four killed as Kyiv vows retaliation after Russia’s devastating attacks on Ukraine