There is a constant buzzing of drones of all sizes above the battlefield in Ukraine as both sides are using unmanned aerial systems in great numbers. Drones have become so important throughout the war that the Ukrainian military has established a separate drone service to control and coordinate the employment of the weapon systems.

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.

Russia attacked Ukraine's energy system and some cities in an "inhuman" Christmas Day assault, Ukraine's President Volodymyr Zelenskyy said.