Ukraine has accused Russia of committing war crimes and torture after around 450 graves were found in territory re-taken by Ukrainian forces in the north-east of the country.
Officials say the graves contain the remains of civilians and around 20 soldiers who are said to have had their hands bound. The claims have not been independently verified.
The bodies were discovered in the city of Izyum which was captured by Russia forces following their invasion. It is back under Ukrainian control after a major new offensive.
Reeta Chakrabarti presents BBC News at Ten reporting by Orla Guerin in Izyum region and from international editor Jeremy Bowen.
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