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.

Moscow again struck Ukraine’s energy infrastructure, part of an effort to wear down the country. “In the trenches, there are no holidays,” one man said.

President Joe Biden said on Wednesday he asked the U.S. Defense Department to continue its surge of weapons deliveries to Ukraine after condemning Russia's Christmas Day attack against some of Ukraine's cities and its energy system.