In 2016 Russia defeated the United States in a cyberwar, selecting the president of the United States. Since that victory, Russia continues its campaign in the dark corridors of cyber, colonizing us at every turn: from the Nunes memo to the Parkland shootings. Cyber-colonization can be resisted but first it must be understood.

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Timothy Snyder is a historian at Yale University, specializing in eastern Europe, totalitarianism, and the Holocaust. His books have received widespread acclaim. His most recent book, "On Tyranny: Twenty Lessons from the Twentieth Century," explores the everyday ways a citizen can resist the authoritarianism of today. He is also the author of "Black Earth: The Holocaust as History and Warning" and, forthcoming in April, "The Road to Unfreedom: Russia, Europe, America."

Follow on Twitter: @TimothyDSnyder