The exact number of prisoners to be transferred as part of the swap is not yet known / Photo from UNIAN

"They have agreed to hold a prisoner swap on December 29 unless something unexpected happens," the Russian daily Kommersant reported with reference to two sources familiar with the content of the negotiations.

Read alsoRussia names condition for prisoner swap

The exact number of prisoners to be transferred as part of the swap is not yet known.

As UNIAN reported earlier, Ukraine's envoy to the humanitarian subgroup, Valeria Lutkovska, said the Ukrainian military who had been captured by the Russian armed forces after the battles near Ilovaisk and Debaltseve would be released by the end of this year.