Russia’s full-scale invasion of Ukraine has severely disrupted one of the world’s most important grain export systems. Before the war, Ukraine relied on Black Sea ports such as Odesa, Chornomorsk, and Pivdennyi to ship agricultural goods globally. Russian attacks on these routes forced Ukraine to develop alternative export corridors, creating new logistical and geopolitical vulnerabilities. In this context, Romania’s Port of Constanta has emerged as a critical hub for Ukrainian grain exports and a key stabilizer of global supply. The shift in shipping routes highlights how economic infrastructure in the Black Sea has become increasingly securitized, while also creating new opportunities for regional cooperation and stronger EU and NATO engagement.