Moscow and Washington maintain contacts through closed channels

Russia and the United States continue to maintain contacts through closed channels, the two sides are in constant dialogue, Kremlin aide Yury Ushakov said.

"They [contacts] are continuing, we are in constant communication," Ushakov said.

Work between Russia and the U.S. is ongoing, and sooner or later certain things will become apparent, the Kremlin aide added.

According to him, agreements reached by Russian President Vladimir Putin and US President Donald Trump in Alaska are the basis for a possible settlement of the Ukraine conflict.

"When it comes to resolving the Ukrainian conflict, the agreements reached by the two presidents in Anchorage serve as a guiding star," Ushakov said.