Shock: Russians leave the hall

For now, it is not known whether the Russian delegation will return to continue the talks, the Russian news agency RIA Novosti said.

By the way, the media reported that the meeting of the delegations ended around 2:30 p.m., after almost two hours.

"Russia has put forward demands that are unrealistic and exceed anything that has ever been the subject of negotiations," said a source from Ukrainian diplomacy after today's talks in Istanbul.

According to this source, among the Russian demands is the withdrawal of Ukrainian forces from its own territory as a condition for a ceasefire.

He added that there were other demands which, as he says, were "unacceptable from the very beginning".