Moscow is concerned about Washington's attempt to “impose mediation services” in the dialogue between Baku and Stepanakert, RIA Novosti cited the Russian Foreign Ministry as saying on June 15, amid reports that the U.S. was “forcing” the representatives of Nagorno-Karabakh to meet with the Azerbaijani side.

"We are concerned about media reports that the United States is now trying to impose its mediation services in the dialogue between Baku and Stepanakert, including through threats of the use of force," the ministry stressed.

Earlier, a diplomatic source in Washington said that the United States was using “ultimatums” to “force” the representatives of Nagorno-Karabakh to meet with the Azerbaijani side.

According to the source, if Karabakh refuses, Washington has promised to support Baku's possible “counterterrorist operation”.