Russian Prime Minister Dmitry Medvedev has branded recent visits of members of the European Commission to a site of mass pro-European Union demonstrations in Kyiv as "flagrant interference in the internal affairs of a sovereign state."

"It looks pretty crazy when incumbent ministers or European Commissioners come out onto a square. I don't think this is the way to behave in the 21st century," Medvedev told a news conference in Moscow.

"Flagrant interference in the internal affairs of a sovereign state is the only name I can use for the trips of some officials from the European Union and from other countries with visits to sites of higher civil activity, sites of unauthorized events," he said.

"But it's the business of our Ukrainian partners who to invite and who not to invite," he added.