Darchiev had served as Russia’s ambassador to the U.S. since March 2025, appointed by President Vladimir Putin. Before this role, he served as Russia’s ambassador to Canada from 2014 to 2021 and worked in the Russian Foreign Ministry’s North America department from 2021 to 2024. He was known for his expertise in U.S.-Russia relations and had a long diplomatic career, having also worked at Russia’s embassy in Washington in the late 2000s.

Darchiev was a veteran diplomat who publicly condemned Western policies and, in 2022, described Russia’s invasion of Ukraine as a “necessary measure.” His tenure as ambassador was seen as part of an effort to improve relations with the U.S. under President Donald Trump.

The Russian Foreign Ministry did not specify the cause of Darchiev’s death, stating only that it was “sudden.” A ministry spokeswoman, Maria Zakharova, later said he died from an unspecified chronic illness.

The U.S. State Department confirmed Darchiev’s death and expressed condolences to his family. A spokesman said, “We offer our condolences to Ambassador Darchiev’s family and loved ones. We refer you to the Russian Government for additional details regarding his passing.”

Darchiev’s appointment in early 2025 followed the return of Donald Trump to the U.S. presidency and came amid ongoing tensions between Moscow and Washington. His death may complicate efforts to restore diplomatic relations, which have deteriorated since the start of Russia’s full-scale invasion of Ukraine in 2022.

The Russian Foreign Ministry praised Darchiev as a “consummate professional and a brilliant expert on American affairs” who served in one of the most critical areas of Russian foreign policy. Colleagues described him as a mentor and a kind friend.

The Russian Foreign Ministry has not announced a successor to Darchiev’s post.