Russian diplomats in Washington are being threatened with violence and US intelligence services try to make contact with them, Tass news agency cited the ambassador as saying on Saturday .
"It's like a besieged fortress. Basically, our embassy is operating in a hostile environment ... Embassy employees are receiving threats, including threats of physical violence," Tass quoted him as saying. The CIA, the FBI, the Office of the Director of National Intelligence and the US State Department did not immediately return messages seeking comment.