Not for the first time, Poland scrambled fighter jets as missiles headed for western Ukraine. And in the capital, Kyiv, fragments from intercepted missiles and drones fell in several places, but there were no reports of injuries.

KYIV—Russia launched one of the biggest missile-and-drone attacks of the war on cities across Ukraine early Sunday, knocking out power in parts of at least three regions, with some areas also reporting water cuts.

The attack came as fears are mounting about Moscow's intentions to devastate Ukraine's power generation capacity ahead of the cold winter.