When Vladimir Putin unleashed an unprovoked invasion of Ukraine on Feb. 24, 2022, the Ukrainian media, public and policymakers almost unanimously began calling the Russian president and the state he leads “rashyst.” The term is a hybrid of a derogatory moniker for Russia – “rasha” – and “fascist.” Ukrainians did so for two reasons. First, they were countering Putin’s absurd insistence that the Ukrainian authorities – including Ukraine’s Jewish president, Volodymyr Zelenskyy – were Nazis and that Ukraine needed to be “de-Nazified.” Since Ukraine’s tiny number of right-wing extremists are about as influential as the Proud Boys in the United...