Conflicts, whether political, commercial or military, affect transport networks. Operators seek to avoid the most tense areas or reconsider certain routes. Certain links can be disrupted in case of local geopolitical tensions, which can have a significant global impact. The article is devoted to studying Ukraine’s maritime network and identifying changes in these structures because of the conflict that started in 2014. The purpose of the paper is to measure and visualise the main changes in the Ukrainian seaport system and maritime forelands from 2010 until the most recent data available (December 2023), from a network models, bilateral trade and route simulation framework. The principal results confirm the huge impact of military conflict on port connectivity, thereby contributing to the recent literature on shipping network vulnerability.