"We are watching this very closely," TASS quotes Trump as saying at a White House briefing.

He noted that the United States has good relations in this region.

“We will see if we can stop this,” the American president added.

Earlier, UN Secretary General Antonio Guterres called on Armenia and Azerbaijan to immediately stop clashes and resume the negotiation process against the background of the aggravation of the situation in Nagorno-Karabakh.