The diplomat died in his 67th year, TASS reported, citing the ministry. The ministry called him "a highest professional" and "a brilliant Americanist" who worked in one of the most sensitive areas of Russian foreign policy. It did not specify the cause of death.
Darchiyev had worked in the diplomatic service since 1992. From 2005 to 2010 he served as minister-counselor at the Russian embassy in the United States, and from 2014 to 2020 as ambassador to Canada. He headed the Foreign Ministry's North America Department in 2010–2014 and again in 2021–2024.
In early 2025 Darchiyev led the Russian delegation at talks with the United States in Istanbul. In March 2025, Vladimir Putin appointed him ambassador to the United States and Russia's permanent observer to the Organization of American States.