US Seizes Tankers in Shadow Fleet to Combat Illicit Oil Trade

Since late 2025, US authorities have seized at least seven tankers linked to Venezuela's oil trade, targeting the shadow fleet that transports illicit oil from sanctioned countries like Iran, Russia, and China. This aggressive enforcement includes pursuing vessels across international waters, raising legal questions about the seizures. The US has filed warrants for more tankers, but only two have been unsealed so far. The shadow fleet comprises aging tankers that evade sanctions and maritime regulations, significantly impacting global oil flows. As of May 2026, US sanctions have constrained Russian oil exports and temporarily removed Venezuela from the market, while Iranian exports remain largely unaffected. The situation highlights the intersection of economic warfare and maritime law enforcement, complicating international relations and maritime safety.

Key Points: • The US has seized at least seven tankers linked to Venezuela's illicit oil trade. • The shadow fleet operates to evade sanctions, compromising maritime safety. • Legal questions arise regarding the basis for US seizures of these vessels.