“There is a nomination coming, which we will announce, this is a key diplomatic post,” he told reporters, his words are quoted by RIA Novosti.
Kirby also declined to provide a timeline for the ambassador's replacement.
On September 4, John Sullivan completed his work as US Ambassador to Russia and left Moscow.
The State Department said that the US authorities will soon announce the candidacy of a new ambassador to Russia.
According to the newspaper Politico, Sullivan attributed his unexpected completion of work to the illness of his wife, who died on Monday, September 5.