The U.S. ambassador to Russia, John Sullivan, ended his tenure as America's top diplomat in Moscow on Sunday after nearly three years, spanning the Trump and Biden administrations, and will retire from a lengthy career in government service.
His departure, which comes in the midst of an increasingly serious crisis over Russia's war in Ukraine as well as disputes over detained Americans in Russia, had been expected this fall as he reached the usual length of time for U.S. ambassadors. But it was sped up due to family medical issue, according to people familiar with the matter who spoke on condition of anonymity because of the private nature of the situation.
"Ambassador Sullivan's departure is planned and part of a normal diplomatic rotation," the State Department said. "He has served a full tenure as U.S. ambassador to Russia, managing one of the most critical bilateral relationships in the world during unprecedented times."