Ukraine suffers 'terrible tragedy'

For nearly a year, so much blood has flood through Ukraine under withering Russian fire that tragedy is never far away. Today brought more sorrow, as a Ukrainian helicopter crashed near a kindergarten in the Kyiv region, killing a government minister and at least three children, among others. President Volodymyr Zelensky calls it a “terrible tragedy” and says there will be an investigation. CNN Senior International Correspondent Fred Pleitgen joins the show from the helicopter crash site. 

Also on today's show: Rafael Grossi, Director General, International Atomic Energy Agency; Rose Abramoff, earth scientist and climate activist; Ro Khanna, US House Democrat. 

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