A source from the group told Interfax, Censor.NET reports.
"So far it was not possible to reach an agreement and set the date for the start of the release of detained persons," the source said.
The group representative also said the talks are quite tense.
"The contradictions of the sides are too strong, so no chance to speak of efficient process so far," the source told the agency.
Ukraine ready to release 309 people for Donbas militants in exchange for 87 Ukrainian hostages, - Tandit(0)