A videoconference of the Trilateral Contact Group for Donbas originally scheduled for Thursday has been postponed at Russia's request, Darka Olifer, the press secretary of former Ukrainian President Leonid Kuchma representing Kyiv in the group, said on Facebook on Thursday.

"At the Russian side's request, the Trilateral Contact Group's videoconference has been postponed. The date is being agreed upon," Olifer said.

Olifer had said on Wednesday that the Trilateral Contact Group planned an extraordinary videoconference on June 23.

The videoconference was to deal with the deterioration of the security situation in Donbas, the release of hostages, and "other clauses of the Minsk Agreements," she said.

OSCE Special Envoy Martin Sajdik had told journalists following a Trilateral Contact Group meeting in Minsk on June 15 that the next meeting of the group was scheduled for June 29.