Why the Iran Conflict Exposes the Fading Power of U.S. Economic Sanctions

Two months after the United States and Israel launched a military campaign against Iran, the conflict remains unresolved. While many analysts focus on the constraints of force and diplomacy, this war has also spotlighted a deeper trend: the eroding effectiveness of U.S. economic coercion. Once the world’s dominant economic and military power, the U.S. has long wielded sanctions as a primary tool—against North Korea, Russia, and especially Iran since 1979. However, the rise of China and a multipolar world have eroded this leverage. Scholars of sanctions and statecraft now argue that the Iran conflict vividly demonstrates the diminishing returns of U.S. economic warfare. Below, we explore key questions about this shift.

What has the Iran war revealed about U.S. economic coercion?

The war has exposed the limits of using sanctions as a primary weapon. Despite decades of punishing Iran through primary, secondary, and targeted financial measures, the U.S. has failed to force a change in Tehran’s behavior or prevent the conflict from dragging on. The protracted nature of the war underscores that economic pressure alone cannot achieve foreign policy goals when global power dynamics are shifting. Sanctions that once crippled economies now see diminishing returns as target nations find alternative trade routes and partners, especially with China and Russia.

How has U.S. economic power changed over time?

Since the end of the Cold War, the U.S. has been the preeminent economic and military force, sitting at the center of global finance with a defense budget far exceeding China’s. This dominance allowed Washington to use economic coercion effectively against countries like North Korea, Russia, and Iran. However, the rise of China and the emergence of a multipolar world have gradually eroded U.S. influence. Other nations now offer alternative financial systems, trade corridors, and military alliances, reducing the bite of U.S. sanctions. The Iran war illustrates this decline, as sanctions alone cannot secure a quick resolution.

What are the historical reasons for U.S. sanctions on Iran?

Since the 1979 Iranian revolution, which overthrew the U.S.-allied shah, Washington has been antagonistic toward Tehran. U.S. policy aimed to punish, contain, and isolate Iran through a mix of primary, secondary, and targeted economic sanctions. These measures were driven by concerns over Iran’s alleged state sponsorship of terrorism across the Middle East and its nuclear program, which emerged in 2003. The nuclear issue led to United Nations sanctions, aligning U.S. and European Union interests. Over time, sanctions became a central tool to pressure Iran, but their effectiveness has waned as Iran adapted through regional allies and alternative economic partnerships.

How did international cooperation strengthen Iran sanctions?

When Iran’s nuclear program drew global concern, the U.S. and EU acted jointly, restricting Iran’s access to the European banking system. This combined pressure proved highly onerous for the Iranian economy, which suffered crushing inflation and food price spikes. Political scientist Adam Tarock noted that Iran was “winning a little, losing a lot” under this coordinated regime. The collaboration showed how multilateral sanctions can amplify economic coercion, but such unity is rare and fragile. Today, the U.S. often acts alone or with fewer partners, weakening the impact of its sanctions.

What was the JCPOA and why did it fail?

The Joint Comprehensive Plan of Action (JCPOA), signed in 2015 between Iran, the U.S., EU members, Russia, and China, placed limits on Iran’s nuclear enrichment in exchange for sanctions relief. At that time, Iran’s economy was devastated by decades of punishment. The deal promised removal of U.S., EU, and UN sanctions, offering Tehran a path to recovery. However, in 2018, the first Trump administration withdrew from the JCPOA and reimposed sanctions as part of a “maximum pressure” campaign. This unilateral move alienated allies and undermined the agreement, as other nations continued to trade with Iran through mechanisms like INSTEX, highlighting the limits of U.S. economic coercion when not backed internationally.

How did the U.S. withdrawal from the JCPOA impact sanctions effectiveness?

The withdrawal signaled a shift from multilateral to unilateral pressure. While the U.S. reimposed sanctions, most global firms refrained from business with Iran due to fear of American penalties. Yet, this unilateral action also prompted Iran to accelerate its nuclear program and forge closer ties with China and Russia, which now provide economic lifelines. The maximum pressure campaign failed to force new negotiations and instead hardened Iran’s stance. The war has made clear that without broad international backing, U.S. sanctions lose much of their bite, as target states can pivot to alternative partners and financial channels.