For years‚ Hungarian prime minister Viktor Orban has loomed over Europe like a continental boogeyman. The long-ruling illiberal leader makes no secret of his distaste for the liberal underpinnings of the European Union’s political project. Orban rails against E.U. censure and criticism over the erosion of Hungarian democracy that’s taken place under his watch. And he has stymied the continental bloc’s ability to muster a robust‚ collective response to support Ukraine’s...