Recently, the U.S. Coast Guard stated that it currently faces difficulties in seizing oil tankers suspected of violating sanctions by transporting Venezuelan crude oil. This acknowledgment highlights the practical challenges Washington encounters in enforcing its sanctions against Venezuela. Although the U.S. has imposed stringent economic sanctions on Venezuela since 2019—banning its oil exports and applying secondary sanctions on third parties involved—tracking, intercepting, and impounding such vessels on the high seas or in foreign ports remains legally and diplomatically complex.Under international law, nations have enforcement authority within their territorial waters, but on the high seas, boarding or seizing foreign-flagged vessels is generally prohibited unless they are engaged in universally recognized crimes like piracy or drug trafficking. Moreover, many Venezuela-linked tankers evade detection through tactics such as ship-to-ship transfers and disabling their Automatic Identification Systems (AIS), making their movements hard to trace. Additionally, some countries refuse to comply with U.S. sanctions, offering safe harbor or port access to these vessels, thereby undermining sanction effectiveness.Analysts note that while the U.S. possesses advanced maritime surveillance capabilities, unilateral sanctions lack teeth without broad international support. The Coast Guard’s recent statement underscores the limitations of relying solely on national power in today’s globalized shipping network. Going forward, the U.S. may need to strengthen cooperation with allies and promote multilateral mechanisms to enhance enforcement of its sanctions regime.
近日，美国海岸警卫队表示，暂时难以扣押涉嫌违反制裁令、运输委内瑞拉原油的油轮。这一表态反映出美方在执行对委内瑞拉制裁措施时所面临的实际操作难题。尽管美国自2019年起对委内瑞拉实施严厉经济制裁，禁止其出口石油，并对参与相关交易的第三方实施次级制裁，但在公海或他国港口追踪、拦截和扣押涉事船只仍存在法律与外交障碍。首先，国际法赋予各国在其领海内的执法权，但在公海上，除非涉及海盗、贩毒等普遍管辖罪行，否则一国无权随意登船检查或扣押外国船只。其次，许多涉委油轮通过“船对船转运”（ship-to-ship transfer）等方式规避追踪，甚至关闭自动识别系统（AIS），使执法机构难以掌握其真实行踪。此外，部分国家拒绝配合美国制裁政策，为相关船只提供庇护或港口服务，进一步削弱了制裁效力。分析人士指出，美国虽拥有强大的海上监控能力，但单边制裁若缺乏国际支持，其执行力将大打折扣。此次海岸警卫队的表态，也凸显出在全球化航运体系下，单靠一国力量难以有效遏制规避制裁行为。未来，美方可能需加强与盟友合作，推动多边机制以提升制裁执行力。
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