KYIV, Ukraine — Russian attacks targeting the eastern Ukrainian city of Kharkiv killed at least four people and wounded more than two dozen others on Saturday, officials said, as hopes for peace dimmed further.

The first wave on Ukraine's second-largest city was a large Russian drone-and-missile attack in the early hours. It killed at least three people and wounded 21 others, according to local officials. In the afternoon, Russia dropped aerial bombs on the city center, killing at least one person and wounding five more, Kharkiv's mayor said.

The warring sides also accused each other of trying to sabotage a planned prisoner exchange, nearly a week after Kyiv embarrassed the Kremlin with a surprising drone attack on military airfields deep inside Russia.

Saturday's barrage — the latest i

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