Russia carried out a series of overnight air attacks on Kyiv and key energy infrastructure targets as President Volodymyr Zelenskyy warned Ukrainians to prepare for the possibility of Christmas Day strikes. Ukrainian air defense officials said Russian troops were carrying out a combined attack using cruise missiles and strike drones on December 23, with a large-scale air raid alert declared across the country. Zelenskyy stated that Russia launched over 650 drones and more than 30 missiles in the overnight attack on Ukraine. "An attack carried out…