Raney Aronson-Rath discusses “20 Days of Mariupol” documentary

It’s hard to read about war. It’s even harder to watch it. But we shouldn’t look away. That’s the lesson of “20 Days in Mariupol,” a searing and heartbreaking documentary produced by PBS series “Frontline” at GBH and the Associated Press. It won this year’s Oscar for best documentary feature film. It’s just the latest in a long list of accolades for “Frontline” under the helm of Raney Aronson-Rath who has been the editor-in-chief and executive producer since 2015 of …