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Chernov makes the point with recourse to the backstory behind a brother and sister he films in a hospital corridor, each grieving the loss of a child.

"I filmed those children – four little feet on the gurney - but couldn't use that. The brother and sister buried their children in a yard, escaped, but then managed to go back ready to give them a proper burial. But the Russians had dug them up and put them with others. So they went through hundreds of decomposing bodies to find their own children, which they did, to bury them properly in the cemetery, just days before the rest were put into a mass grave."

The atrocity against Mariupol is probably – so far – the most egregious war crime on European soil since the second world war. There are an estimated 25,000 dead in Mariupol, "though the total is probably treble that," says Chernov.

‘War criminals: whatever you do, we’ll record it’: the ‘merciless’ Ukrainian film about Mariupol | Ukraine | The Guardian