Ukraine's new Western-backed President Petro Poroshenko vowed Sunday to halt by the end of the week nearly two months of bloodshed in the separatist east that have threatened the very survival of the ex-Soviet state.
But his pledge was immediately dismissed as political grandstanding by insurgents who have proclaimed independence in two vital industrial regions that are now seeking a formal invitation to join Russia.
And Poroshenko himself did not spell out how he intended to make the pro-Russian gunmen comply with the ceasefire or whether he would order a full military withdrawal from the restive Donetsk and Luhansk regions.
"We must end the fighting this week," Poroshenko said following a round of talks with Moscow's ambassador to Kyiv and an envoy from the Vienna-based Organisation for Security and Cooperation in Europe (OSCE).
"For me, every day in which people die, every day in which Ukraine pays such a high price, is unacceptable."
The 48-year-old candy magnate — dubbed the "chocolate king" — delivered a forceful inauguration address the day before in which he vowed never to accept Russia's seizure of Crimea or give up on Ukraine's new pro-European course.
He flatly rejected dialogue with "gangsters and killers" who both Kyiv and the West accuse the Kremlin of backing.
But the political veteran also said separatists who had "no blood on their hands" would be offered safe passage back to Russia.
A top leader in the self-proclaimed "Donetsk People's Republic" said he doubted Poroshenko's sincerity and was still mobilizing his troops.
"We do not know what exactly Poroshenko said concerning an end to the fighting, but we somehow doubt that he will be withdrawing troops," Donetsk "deputy governor" Andriy Purgin told Russia's Interfax news agency.
"We are continuing to mobilize, preparing volunteers for the defense of Donetsk."
Gunmen attempt raids on Luhansk's airports
Europe's worst security crisis in decades has now plunged East-West relations into a Cold War-style standoff and left the ex-Soviet country of 46 million facing disintegration and economic collapse.
Daily battles in the region of nearly seven million people have claimed more than 200 lives since mid-April and continued unabated on Sunday.
A Ukrainian military source told AFP that gunmen had staged a series of unsuccessful raids late Saturday and early Sunday on an airport in the Russian-border city of Luhansk.
The source said Ukrainian forces suffered no casualties but could not say if any militants had been killed.
The insurgents lost more than 40 fighters — most of them Russian nationals — while briefly seizing the main international hub in the neighboring industrial city of Donetsk in late May.
Ukrainian media also reported intense fighting involving mortar fire and air assaults being waged in the region's rebel stronghold of Slovyansk.
Poroshenko said the first step in his peace plan involved restoring "the Ukrainian border so that the safety of each Ukrainian citizen is guaranteed."
Both militants and weapons have been crossing into Ukraine from Russia in growing numbers without any visible efforts to stop them by either President Vladimir Putin or his generals.
But the Russian leader appeared to respond to US pressure Saturday by demanding that the FSB security service step up the border region's defense.