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.

Moscow’s drone strikes have grown exponentially thanks in part to a deal with Iran to produce its Shahed drones on Russian soil. An attack overnight that focused on Kyiv killed at least 15.

(Reuters) -Waves of Russian drones and missiles struck districts across the Ukrainian capital Kyiv early on Tuesday, damaging an apartment building, sparking fires and injuring up to 16 people, city officials said.