Russia launched “one of the largest air attacks” of the war overnight, Ukraine’s foreign minister said, firing more than 200 missiles and drones at the country’s energy infrastructure.

Andrii Sybiha said Russia targeted “critical infrastructure” in “peaceful cities,” causing “preventative” outages.

Volodymyr Zelensky said the “massive” attack, which used ballistic and cruise missiles, targeted every region in Ukraine and damaged military airfield infrastructure.

“The enemy’s target was our energy infrastructure across Ukraine,” the Ukrainian president said. “As of now, some areas remain without power, but all necessary forces are working to mitigate the consequences and restore the infrastructure.”

Ukrainian officials have warned Russia would likely target the country’s energy infrastructure ahead of what is expected to be a harsh winter.