BUCHA, Ukraine—Ukrainian President Volodymyr Zelensky described Russian forces as murderers and rapists as the extent of killings in towns surrounding Kyiv began to emerge, vowing to prosecute what he called war crimes as Russia ramped up attacks in the east of the country.

More than 100 civilians were found buried in mass graves in the commuter town of Bucha after Russian troops withdrew last week, sparking an outcry from Western leaders and adding to the pressure on the Biden administration and its European allies to take stronger action against Moscow.

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