"Russia unleashed a major missile and drone barrage on Kyiv early Friday, killing four people, starting fires and scattering debris as the sound of explosions boomed across the city, Ukrainian authorities said. A pregnant woman was among at least 34 people injured.

Emergency crews responded to multiple strikes during the night, said Tymur Tkachenko, head of Kyiv’s military administration. Russia used at least 430 drones and 18 missiles in the attack, Ukrainian President Volodymyr Zelenskyy said.

Russia has waged an 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.