KYIV, Ukraine — Russia unleashed a major missile and drone barrage on Kyiv early Friday, killing six people, leaving gaping holes in apartment buildings and starting fires as the sound of explosions boomed across the city and lit up the night sky. A pregnant woman was among at least 35 people wounded, Ukrainian authorities said.

Russia used at least 430 drones and 18 missiles in the nighttime attack, Ukrainian President Volodymyr Zelenskyy said.

Russia has waged a devastating aerial campaign against Ukraine since its all-out invasion of its neighbor nearly four years ago. U.S.-led diplomatic efforts this year to stop the fighting have so far come to nothing.

Friday’s aerial assault, which also targeted Odesa in the south and Kharkiv in the northeast, was mostly aimed at Kyiv, where dron

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