LOS ANGELES (AP) — Two documentaries detailing the punishing effects of Russia's war on Ukraine will air on PBS' “Frontline” investigative series. The specials are part of an extensive collaboration between the series and The Associated Press that includes gathering, verifying and cataloging potential war crimes and co-publishing stories and videos from AP and “Frontline" war reporting. “Putin’s Attack on Ukraine: Documenting War Crimes,” will describe the toll of previous Russian conflicts and the invasion of Ukraine.