Brave Ukrainian soldiers are risking their lives to defend their nation and their families against Russian aggression. There's only one problem: Many of those fighting for today's Ukraine also seem to be fighting for a Ukrainian past that is shameful. Most Americans and Europeans applaud the heroic Ukrainian military and hope for its victory over Russia's aggression. But these same people might clap more softly if they saw how many of these Ukrainian and allied "heroes" are wearing symbols that are unambiguously associated with Hitler's Nazi Germany. Some of the most recent battles of the war have taken place inside...