KIEV - Ukraine's election body issued a stark warning Saturday that it may be impossible to hold next week's presidential election in the east, where a pro-Moscow insurgency is threatening to plunge the country into all-out civil war.
Russia also questioned how an election taking place under the "thunder of guns" could possibly meet democratic norms and demanded that Kiev halt its offensive against the rebels.
The Central Election Commission called for the authorities in Kiev to take urgent action to ensure security in the east, saying that violence could prevent almost two million people from voting on May 25.
Its warning came as Ukraine's embattled Western-backed government began a second round of "national unity" dialogue called for under an OSCE-sponsored peace plan.
But again, no separatist leaders were invited to the round-table talks being held in the eastern city of Kharkiv, to Russia's chagrin.
"Round tables are beautiful things but they won't solve anything," said Aleksandr Borodai, "prime minister" of the rebels' self-declared People's Republic of Donetsk.
"While our territory is occupied there will be no negotiations." The West sees next Sunday's election as crucial to defusing the crisis on Europe's eastern flank and preventing the former Soviet republic from disintegrating further after Russia's annexation of Crimea.
But the election commission said it could not prepare for the vote in the east because of threats and "illegal actions" by separatists who have overrun more than a dozen towns and cities since early April.
Despite a month-long offensive, the Ukrainian military has failed to wrest back control of the main industrial regions of Donetsk and Lugansk, where rebels have now declared their own independent republics in defiance of Kiev and the West.
'Phony' unity effort
"Can elections held amid the thunder of guns really meet the democratic norms of the electoral process?" Russia's foreign ministry asked in a statement, urging Kiev to immediately halt "punitive action against its own citizens".
It also said the government was using the unity talks "as a cover for aggressive action" and urged Western nations to tell Kiev to "launch real and not phony work towards national reconciliation".
But the United States and its allies are piling further pressure on Moscow to allow the election to go ahead.
In a phone call Friday, President Barack Obama and French counterpart Francois Hollande "underscored that Russia will face significant additional costs if it continues its provocative and destabilising behaviour", the White House said in a statement.
Obama has already drafted an executive order for sanctions across key sectors in Russia such as banking, energy, defence and mining, adding to punitive measures already imposed by Washington and Brussels.