Biden's statement comes as his administration works to send as much aid to Ukraine as possible before Trump, who has vowed to end the war, assumes office.

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

President Biden on Wednesday denounced Russia’s latest attack on Ukraine, declaring the wave of missiles and drones “outrageous.” “The purpose of this outrageous attack was to cut off the Ukrainian people’s access to heat and electricity during winter and to jeopardize the safety of its grid,