Five people have been killed and close to one million residents are without power after strikes on key energy infrastructure across Ukraine.
Russia fired 150 missiles and drones in the largest assault on Ukraine’s energy grid since the conflict began.
The city of Kharkiv and parts of Odesa were the worst-affected areas.
Russia said the attacks were in response to previous Ukrainian incursions into Russian territory.
Russia’s war with Ukraine has now lasted over two years.