Ukrainian filmmaker and Pulitzer Prize-winning journalist Mstyslav Chernov offers a window into the practices of conflict zone reporters and an unflinching, anguishing account of the 20 days he and colleagues spent covering Mariupol. "20 Days in Mariupol" is a @frontline and @AssociatedPress collaboration. The documentary premieres in select theaters this summer and comes to PBS this fall. Find screenings near you: https://20daysinmariupol.com/ Instagram: https://www.instagram.com/20daysinmariupol/ Twitter: https://twitter.com/20daysmariupol Facebook: https://www.facebook.com/20daysinmariupol This journalism is made possible by viewers like you. Support your local PBS station here: https://www.pbs.org/donate. #Documentary Subscribe on YouTube: http://bit.ly/1BycsJW​ FRONTLINE is produced at GBH in Boston and airs nationwide on PBS. Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Additional funding is provided by the Abrams Foundation; Park Foundation; the John D. and Catherine T. MacArthur Foundation; and the FRONTLINE Journalism Fund with major support from Jon and Jo Ann Hagler on behalf of the Jon L. Hagler Foundation, and additional support from Koo and Patricia Yuen.