Russia launched its most concentrated barrage of the year on Ukraine, targeting energy infrastructure and cities. Officials reported at least four deaths in Kharkiv and widespread power outages in Kyiv and other regions amid freezing temperatures. Ukraine's air defense systems intercepted a significant number of missiles and drones, but damage to power plants and substations occurred, leading to emergency power cuts. This attack follows previous large-scale bombardments and comes as diplomatic efforts to end the conflict remain stalled.