The so-called national unity discussions -- which crucially do not involve the insurgents -- are being held barely two weeks before Ukraine holds a presidential election that the West is scrambling to keep alive.
European leaders have been working to bring Kiev and pro-Moscow separatists together under a roadmap sponsored by pan-European security body the OSCE.
But shortly before the talks started, Russia bluntly warned that the former Soviet republic was already on the brink of civil war and demanded that the insurgents be invited to the negotiating table.
"Those with weapons in hand who are waging a war against their own country and dictating the will of a neighbouring country will answer before the law. We will not yield to blackmail," he said.
"We are ready to listen to the people of the east but they must not shoot, loot or occupy government buildings."
The east of Ukraine remains on edge, with deadly violence erupting often as government troops battle against the separatists who have seized over a dozen towns and cities since early April.
And the crisis showed no signs of easing despite the flurry of diplomatic efforts following hotly disputed weekend independence referendums in the eastern industrial regions of Donetsk and Lugansk that raised fears of partition.
"When Ukrainians kill Ukrainians I believe this is as close to a civil war as you can get," Russian Foreign Minister Sergei Lavrov said in an interview with Bloomberg television.
"In east and south of Ukraine there is a war, a real war," he said.
But he said Moscow had no intention of sending in troops to eastern Ukraine as it did while annexing Crimea in March, a move that outraged Kiev and the West.
European leaders had called for today's talks to be as inclusive as possible.
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