Those two words -- "never again" -- have echoed through history as a promise to the dead and a warning to the living. Never again will we allow atrocities to be committed with impunity. Never again will the rest of the world just stand by and watch. But now, Vladimir Putin’s unprovoked war in Ukraine is testing that promise and the West’s will to stop him. Ukrainian President Volodymyr Zelensky is accusing Putin of genocide, a claim also made by President Biden. Tonight, Christiane looks back at the origins of that word, “genocide,” and two men who ensured the world wouldn’t look away after the horrors of World War II: Benjamin Ferencz, the last surviving prosecutor from the Nuremberg trials and the first prosecutor to use the term “genocide” in a court of law; and Raphael Lemkin, the man who coined the word in 1944. 

Also in today's show: Christiane visits Babyn Yar, the site of the murder of 33,000 in World War II; journalist Mark Follman, who's spent the past decade focusing on gun violence in America, talks about this week's subway shooting in New York.

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