The Russian Foreign Ministry confirmed the sudden death of the veteran diplomat on November 11.
The Russian Ambassador to the United States, Alexander Darchiev, died on November 11 at the age of 66, according to the Hindustan Times.
The Russian Foreign Ministry announced the sudden passing in an official statement on Wednesday but did not provide a cause of death.
Darchiev had been appointed as the ambassador to the US in early 2025, replacing Anatoly Antonov.
The ministry described the deceased as a highly skilled diplomat and an expert on American affairs who served as a mentor and colleague.
Before his current posting, Darchiev served as Russia's ambassador to Canada for six years and headed the North American Department of the Foreign Ministry for four years.
Former Russian diplomat Boris Bondarev previously described Darchiev as a protégé of Yury Ushakov, a senior aide to President Vladimir Putin.