Meeting a day after sharply-criticised separatist votes in eastern Ukraine, EU foreign ministers ramped up sanctions, slapping an asset freeze and travel ban on a further 13 people.
For the first time in the months-long crisis, the ministers also targeted entities, extending the EU blacklist to 61 names by also freezing the assets of two firms confiscated in Crimea and Sevastopol after Russia's March annexation of the territory.
"I hope we will strongly support those elections," said British Foreign Secretary William Hague. "In the vast majority of Ukraine there is no difficulty with the elections going ahead."
In Brussels to brief the ministers on his talks with Russian President Vladimir Putin last week, Swiss President Didier Brkhalter, current chair of the influential East-West security organisation OSCE, said there was "a window of opportunity of a few days" ahead of the vote.
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"It is very important that we believe that the election can take place and that we act in that direction," he said.
But first the OSCE was attempting to launch a national dialogue to bring all players around the table, from the government, the parliament and the regions.
Repeatedly stressing "we can't lose time", Berkhalter said he hoped not only for wide Ukrainian support but also the backing of the EU, Russia and the United States to enable roundtable talks to launch in the next few days.
"We have seen in Moscow that there is an openness for a dialogue," said Burkhalter.