伊朗封锁霍尔木兹海峡切断约20%的全球油气运输及约三分之一的全球化肥贸易，展示其以关键经济节点作为杠杆的能力，复制美国长期使用的制裁逻辑。美国曾在冷战后数十年内近乎垄断经济制裁工具，但当前格局已转变。2025年中国针对美国出口管制实施稀土反制，迫使美国产业链在国防、航空与汽车领域出现生产延误，并推动双方在2025年10月达成缓和协议，标志经济对抗由单极向多极演变。

经济武器的相互使用产生显著溢出效应。伊朗行动引发能源价格冲击，迫使美国暂时放松对俄罗斯石油制裁，欧盟亦可能调整对俄能源依赖以降低经济损失。该过程显示政策权衡的约束增强，即在能源市场中使用制裁的边际成本上升，削弱其作为单边工具的有效性，并在多方互动中形成反向制约关系。

历史数据表明制裁成功率有限且呈递减趋势。2017至2021年卡塔尔封锁未达目标，西非国家经济共同体对马里、布基纳法索和尼日尔的制裁亦未改善关系。受制裁国家通过贸易重定向与供应链调整降低冲击，例如俄罗斯在2022年后转向亚洲市场，中国企业通过产能外迁与技术替代应对出口限制。持续施压导致边际效用递减，并在部分情形下从经济冲突升级为军事冲突，表明制裁与战争之间的替代关系正在弱化。

Iran’s closure of the Strait of Hormuz cuts roughly 20% of global oil and gas flows and about one-third of global fertilizer trade, demonstrating its ability to weaponize a key economic chokepoint by replicating tactics long used by the US. After decades of near-monopoly over sanctions following the Cold War, US dominance has eroded. In 2025, China retaliated against US export controls with rare earth restrictions, disrupting defense, aerospace, and automotive supply chains and leading to a de-escalation agreement in October 2025, marking a shift from unipolar to multipolar economic coercion.

The mutual use of economic weapons creates significant spillover effects. Iran’s actions triggered an energy price shock, forcing the US to temporarily ease sanctions on Russian oil, while the EU may also adjust reliance on Russian energy to limit economic damage. This illustrates rising policy trade-offs, where the marginal cost of sanctions in energy markets increases, reducing their unilateral effectiveness and creating counterbalancing dynamics among major economies.

Historical evidence shows low and declining success rates of sanctions. The 2017–2021 blockade of Qatar failed, and Ecowas sanctions on Mali, Burkina Faso, and Niger did not restore relations. Targeted states mitigate impact through trade reorientation and supply chain adaptation, as Russia shifted toward Asian markets after 2022 and Chinese firms relocated production while accelerating domestic innovation. Sustained pressure yields diminishing returns and, in some cases, escalates from economic conflict to military confrontation, weakening the substitutive role of sanctions relative to war.