Iran War Highlights the Declining Effectiveness of U.S. Economic Sanctions

U.S. Economic Sanctions Fail to Resolve Iran Conflict

Two months after the United States, alongside Israel, initiated a military campaign against Iran, the conflict shows no signs of resolution. While much of the discussion has focused on the limitations of military and diplomatic strategies, the war has also underscored a critical reality: the diminishing effectiveness of U.S. economic sanctions.

For decades, the U.S. has been the world’s dominant economic and military power, wielding sanctions as a primary tool of foreign policy. From North Korea under the Kim regime to Russia following its invasion of Ukraine, and Iran since the 1979 revolution, sanctions have been a go-to strategy. However, as U.S. global influence wanes amid the rise of China and a shifting multipolar world order, its ability to enforce economic coercion has weakened. Scholars of economic sanctions argue that the ongoing conflict with Iran demonstrates the reduced impact of these measures.

The History of U.S. Sanctions on Iran

Since the 1979 Iranian Revolution, U.S.-Iran relations have been marked by hostility. Washington has consistently pursued policies of punishment, containment, and isolation, primarily through a combination of primary, secondary, and targeted financial sanctions. These sanctions have targeted Iran’s alleged state sponsorship of terrorism and its nuclear program.

The discovery of Iran’s nuclear program in 2003 led to United Nations sanctions, aligning U.S. and European Union interests against Tehran. The coordinated sanctions restricted Iran’s access to the European banking system, imposing severe economic strain. As political scientist Adam Tarock observed, Iran was "winning a little, losing a lot."

The JCPOA Era and Its Collapse

In 2015, the Joint Comprehensive Plan of Action (JCPOA) was negotiated between the U.S., Iran, members of the EU, Russia, and China. The agreement imposed limits on Iran’s nuclear activities in exchange for sanctions relief. At the time, Iran’s economy was plagued by high inflation and soaring food prices, making the deal a potential lifeline.

However, the U.S. withdrew from the JCPOA in 2018 under the Trump administration and reimposed sanctions as part of its "maximum pressure" campaign. Despite lacking global support, the move deterred most international firms from engaging with Iran due to perceived risks. In response, Iran resumed its nuclear enrichment program in 2019, further complicating diplomatic efforts.

Biden’s Approach and Iran’s Nuclear Escalation

The Biden administration has since signaled a shift in policy, though its effectiveness remains uncertain. The return of sanctions has not deterred Iran, which continues to advance its nuclear program. The failure of economic coercion to achieve U.S. foreign policy objectives in Iran highlights a broader trend: sanctions are increasingly ineffective in a multipolar world.

"As scholars of economic sanctions and statecraft, we believe that the conflict against Iran has made clear the diminishing returns of U.S. economic sanctions."

Why U.S. Sanctions Are Losing Their Bite

The ineffectiveness of sanctions in Iran reflects a larger global shift. As China and other powers rise, the U.S. can no longer dictate global economic terms unilaterally. Countries like China, Russia, and even some EU nations have continued trade with Iran, undermining U.S. sanctions. This erosion of global compliance has reduced the leverage Washington once held.

The war in Iran has exposed the limits of economic coercion, proving that sanctions alone cannot achieve lasting foreign policy goals. As the world becomes more multipolar, the U.S. must adapt its strategies or risk further diminishing returns on its economic tools.