Ukraine's Prosecutor General Iryna Venediktova visits the site of a mass grave in the gardens of the St Andrew church in the town of Bucha, northwest of Kyiv, on April 8, 2022, during Russia's military invasion launched on Ukraine. - Ukrainian investigators began to exhume a mass grave in Bucha on April 8, opening the early stages of what police say will be a war crimes probe targeting Russian troops who occupied the Kyiv commuter town. The grave -- a long deep trench in the mud behind a gold-domed church -- was used by Ukrainians to bury neighbours they claim were killed at the hands of Russian armed forces which arrived on February 26. (Photo by Genya SAVILOV / AFP)