EU 'deeply shocked' at Ukraine mass graves: Borrell
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His statement came after Ukrainian investigators pulled hundreds of hastily buried bodies from a forest outside the city, in the eastern Kharkiv region.
Kyiv officials say they have counted 450 graves at the mass burial site and found 10 alleged "torture centres" after the Kharkiv region was recaptured from Russian invaders.
"Thousands of civilians have been already murdered, many more tortured, harassed, sexually assaulted, kidnapped, or forcibly displaced," said Borrell.
"This inhuman behaviour by the Russian forces, in total disregard of international humanitarian law and the Geneva conventions, must stop immediately.
In his statement Friday, Borrell said: "Russia, its political leadership, and all those involved in the ongoing violations of international law and international humanitarian law in Ukraine will be held accountable."