Carnage left by Russian soldiers on the road to Kyiv wasn’t random. It was strategic brutality, perpetrated in areas under tight Russian control where military officers — including one of Russian President Vladimir Putin’s top generals accused of war crimes in Syria — were present. The man in charge of this war was Col. Gen. Alexander Chaiko, earned a global reputation for brutality as leader of Russia’s forces in Syria. This story is part of AP/FRONTLINE investigation that includes War Crimes Watch Ukraine interactive experience and documentary “Putin’s Attack on Ukraine: Documenting War Crimes,” on PBS. Witnesses and survivors in...