In Ukraine’s south, the city of Mykolaiv was among the worst hit, with at least two people killed and several injured, while the Black Sea port of Odesa experienced a city-wide power cut.
In the capital, Kyiv, fragments from intercepted missiles and drones fell in several places, but there were no reports of injuries.
In a statement, Poland confirmed that operations by Polish and allied aircraft were underway.
“Due to a massive attack by Russia, which is carrying out strikes using cruise missiles, ballistic missiles and drones against sites located, among other places, in western Ukraine, operations by Polish and allied aircraft have begun,” it said.