Families in Ukrainian cities are taking refuge from massive swarms of Russian drones, as Moscow steps up its airborne assault with attacks designed to undermine Ukrainian morale.

Ukrainian officials say three people were killed and 13 were wounded when Russia attacked the country with waves of drones and missiles.

Explosions were heard in Kyiv amid an attack by Russian Shahed kamikaze drones, according to the city’s mayor, Vitalii Klitschko, the Kyiv City Military Administration, and RBC-Ukraine's own correspondent.