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.

Russia launched an “inhumane” attack on Ukraine’s energy infrastructure, causing blackouts in several regions and explosions across the country on Christmas morning, Ukrainian President Volodymyr Zelensky said Wednesday.