A concentrated, nine-minute-long Russian drone attack on Ukraine's second-largest city of Kharkiv on Wednesday killed six people and injured 64, including nine children, Ukrainian officials said. The attack followed Russia's two biggest air assaults of the war on Ukraine this week,

One of the hardest-hit areas was the city of Kharkiv in northeastern Ukraine, where 17 attack drones struck two residential districts, Mayor Ihor Terekhov said.