Ukraine reports nearly 300 drones and over a dozen ballistic missiles launched by Russia overnight.
Strikes targeted civilian areas, cutting power to hundreds of thousands amid freezing winter conditions.
President Zelenskyy had warned of a large-scale attack, describing it as the most intense wave this year.
Emergency crews rescued people from rubble, with witnesses reporting casualties at postal facilities.
Russian attacks focused on energy infrastructure, plunging cities into darkness and crippling heating systems.
Centres providing warmth and charging facilities struggled to operate, leaving residents exposed to the cold.
Al Jazeera’s Audrey MacAlpine reports from Kyiv.
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