We assume that it will probably be 1,200 people on each side, and this will again be the largest exchange of prisoners of war,' says Vladimir Medinsky

Russia and Ukraine agreed to a new prisoner exchange after their delegates met for a second round of renewed peace talks in Istanbul on Monday, but there was no sign the warring sides were any closer to reaching a ceasefire deal than they were when direct negotiations were restarted a month ago.

Russia and Ukraine have completed the first phase of what is expected to be the biggest prisoner exchange since the start of the war, with almost 800 people released on Friday.