On the "CBS News Weekend Roundup", host Allison Keyes hears from CBS's Charlie D'Agata and Pamela Falk as the world marks one year since Russia invaded Ukraine. We'll have the latest on that toxic train derailment in Ohio. In the Kaleidoscope, Allison gets the low down on Black Twitter from CBS's Jericka Duncan and her new documentary.

Featured: CBS's Debora Patta on how Ukrainian soldiers are dealing with their PTSD.

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