The Ambassadorial Series is a collection of interviews with nine former U.S. ambassadors to Russia and the Soviet Union, presented in video, podcast, and PDF format, for use by scholars and students of international relations. A new segment, the interview with Ambassador John Sullivan by Jill Dougherty has been recorded in January 2023 and added to the Ambassadorial Series.

In his interview for the Ambassadorial Series John Sullivan, US Ambassador to Russia for both the Trump and Biden administrations, shares his experience during the phase of increasingly tense relations between the United States and Russia that culminated in the February 24, 2022 invasion of Ukraine.