In the quarter-century since the end of the Cold War, profound grievances, misperceptions and disappointments have often defined the relationship between the United States and Russia. I lived through this turbulence during my years as a diplomat in Moscow, navigating the curious mix of hope and humiliation that I remember so vividly in the Russia of Boris N. Yeltsin, and the pugnacity and raw ambition of Vladimir V. Putin’s Kremlin. And I lived through it in Washington, serving both Republican and Democratic administrations.

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