Russia's foreign minister, Sergei Lavrov, has called the fatal clashes in Odessa on 2 May "a manifestation of pure Nazism".
Mr Lavrov was quoted on the Russian foreign ministry's official twitter feed as saying the latest developments in Ukraine are "an outpouring of sheer Nazism".
European Union foreign ministers added 13 people to their visa ban and asset freeze list over Ukraine's crisis.
Well that’s the voting over, and no surprises so far. A ‘Yes’ vote claimed to be 89% in Donetsk, and suddenly Ukraine is no more.
Nearly 90 percent of voters in eastern Ukrainian region voted for self-rule, the head of the separatist election commission said.