Just Europe, remembering.… They still taught maps in school as if borders were lines. In Warsaw, Riga, Vilnius, Bucharest—children traced them in blue ink, clean and calm, as though history respected geometry. But adults in Eastern Europe knew better. Borders were not lines. They were weather systems. Captain Aleksandra Wysocka stood in the underground command room beneath the Polish Ministry of National Defence and watched weather arrive. Not rain. Radar. Signals from Kaliningrad. Transponder failures over the Baltic. Another Russian Tu-22M3 bomber flight over international waters, escorted by fighters, skimming the edges of NATO airspace until French Rafales from Šiauliai rose to meet them. Routine, officially. Another “scheduled flight over neutral waters,” according to Moscow. Another interception, according to NATO. Another reminder, according to everyone living east of Berlin. Aleksandra had grown up with her grandmother...