On Ukraine, the neo-isolationists of the right are fighting the last war. [cut] It is certainly true that Bush administration foreign policy became much too idealistic, bordering on otherworldly, over time. That doesn’t mean that, in reaction, we need to jettison all moral discernment in foreign affairs. Yes, Ukraine is a corrupt and ramshackle democracy, but there can be no doubt about its superiority to Vladimir Putin’s venal dictatorship, or about Russia’s culpability for launching a hideous war of aggression. To say otherwise is to ignore all the relevant distinctions in this conflict — between who is the aggressor and...