["The World Economy, EarlyView. ", "\nABSTRACT\nThis study analyses weekly port calls from 2019 to 2026 to evaluate the Russia–Ukraine war's impact on maritime trade. The data reveals clear structural shifts that Ukrainian traffic moved from high‐risk areas like Odesa to safer Danube River ports. On the other hand, Russia sustained its maritime activity by navigating sanctions and redirecting exports to Asian markets. The Black Sea Grain Initiative also improved navigation conditions for both countries. Overall, the war caused domestic port substitution within Ukraine and a broader logistical reorganization for Russia.\n"]