After the December 2025 strike on Pivdennyi port, authorities failed to promptly seal the Small Adzhalyk Estuary. The sunflower oil spill spread 55 km along the Odesa coast, covering 130 km² and contaminating beaches. Hundreds of oil-coated birds were rescued, while dead wildlife later appeared as far as Tuzly Lagoons.
Experts warned that early containment with booms and skimmers could have localized pollution. Instead, delayed or ineffective measures allowed oil to enter open waters. Unlike crude oil, liquid vegetable oil is harder to collect, less responsive to booms and unsuitable for chemical dispersants. Once dispersed, cleanup chances drop sharply.
Volunteers and the Odesa Zoo led bird rescue efforts. Specialists from Mechnikov National University and other institutions joined rehabilitation work. Still, infrastructure shortages and blackouts complicated care.
Oil residues and dead wildlife were later recorded in Tuzly Lagoons National Nature Park, while ecological risks remain high across the Gulf of Odesa.
Vegetable oil spreads faster than heavy petroleum in shallow, semi-enclosed basins. In winter, low temperatures slow biodegradation while storms fragment slicks into micro-droplets that settle onto seabeds. This can smother benthic organisms and form oxygen-depleting films. Estuaries like Kuyalnik or Small Adzhalyk are especially vulnerable because limited water exchange traps pollutants.
To reduce future damage, ports require wartime contingency plans: rapid estuary closure systems, pre-installed boom anchoring points, mobile skimmer fleets, wildlife rehabilitation centers, and trained response teams. Prevention and early containment are the only truly effective strategies.