Russia launched aerial attacks on Ukraine’s energy sector “on a massive scale” overnight into Wednesday, local authorities said, with explosions reported across the country amid intensified bombardments that have left Ukraine in a precarious position while the war grinds into a third winter.

Ukraine’s President Volodymyr Zelensky condemned Russia’s President Vladimir Putin for greenlighting an “inhumane” Christmas Day attack, including missiles and drones, that damaged Ukraine’s energy infrastructure and left thousands with power outages.