MOSCOW, April 19. /TASS/. Russia urges US Department of State special representative for Ukraine Kurt Volker to focus on his functions of a mediator, and not indulge in speculations outside the range of his competences, Russian Foreign Ministry spokeswoman Maria Zakharova told a news briefing on Thursday.

She explained that instead of performing his immediate functions Volker "appears in talk shows and at conferences and makes lengthy confrontationist statements" and calls for severing cooperation with Moscow.

"We urge the US special representative to be more serious and responsible about performing his duties, the more so, since it is our common cause to focus efforts not on the statements I’ve just mentioned but on the constructive search for mutually acceptable solutions concerning various aspects of a settlement, including the parameters of a likely UN peace-keeping mission in Donbass," Zakharova said.