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.

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.