Trump’s Iran Sanctions: Lessons from a Failed Strategy

Background of Trump’s Iran Policy

When Donald Trump entered the White House in 2017, his administration took a hard line toward Tehran. The president repeatedly called the Joint Comprehensive Plan of Action (JCPOA) a "bad deal" and promised to replace it with a tougher approach. By May 2018, the United States formally withdrew from the nuclear agreement and reinstated a suite of sanctions that had been lifted under the deal.

Withdrawal from the JCPOA

The decision to exit the JCPOA was announced in a televised address. Trump argued that the agreement failed to address Iran’s ballistic‑missile program and regional activities. The withdrawal triggered a cascade of secondary sanctions aimed at foreign entities that continued to do business with Iran.

Reimposed sanctions

Within weeks, the Treasury Department issued new restrictions on Iran’s oil exports, banking sector, and access to the global financial system. The sanctions targeted major Iranian banks, prohibited most imports of Iranian oil, and warned non‑U.S. companies of penalties for facilitating prohibited transactions.

Economic impact of the 2018 sanctions

Initial reports suggested that the sanctions would cripple Iran’s economy. Oil revenue, which had been the backbone of the country’s fiscal budget, fell sharply. However, the real picture proved more complex.

Oil exports and revenue

Iran’s official oil exports dropped from roughly 2.5 million barrels per day in early 2018 to under 1 million barrels per day by the end of the year. Yet, a combination of illicit ship‑to‑ship transfers, covert routes through neighboring ports, and the willingness of some Asian buyers to pay a premium kept a portion of the flow alive.

Banking restrictions

The sanctions targeted the Central Bank of Iran and several commercial banks, aiming to cut the country off from SWIFT and other international payment networks. In response, Iran turned to alternative systems such as the Russian‑backed SPFS and a domestic digital currency initiative. These workarounds reduced the immediate shock to the financial sector.

Why the sanctions fell short

Several factors limited the effectiveness of the 2018 sanctions package.

Iran’s workarounds

• Development of alternative payment channels reduced reliance on Western banks.
• Expansion of illicit oil‑shipping methods kept a fraction of revenue flowing.
• Domestic subsidies and price controls insulated the population from the worst of the price spikes.

Global market dynamics

During the same period, global oil prices fell dramatically, reaching lows below $30 per barrel in early 2020. The reduced price mitigated the impact of lower export volumes, allowing Iran to generate comparable earnings with fewer barrels sold.

The current push for renewed pressure

In 2024, Trump signaled a renewed interest in using economic levers to bring Iran back to the negotiating table. The former president suggested that a fresh round of sanctions could force Tehran to curb its regional activities and resume talks on its nuclear program.

Recent statements

During a recent rally, Trump claimed that “the next set of sanctions will be even tougher than before.” He emphasized the need for “maximum pressure” and hinted at targeting Iran’s maritime logistics and its emerging cryptocurrency projects.

Potential diplomatic paths

Analysts note that any new sanctions would need to be coordinated with European allies and regional partners to avoid the loopholes that undermined the 2018 effort. A multilateral approach could include:

1. Re‑imposing strict limits on oil exports with robust monitoring.
2. Targeting entities that facilitate Iran’s illicit shipping networks.
3. Coordinating with the International Monetary Fund to tie financial assistance to compliance milestones.

Such a strategy would require careful calibration to avoid harming civilian populations while still pressuring the government.

Lessons for future policy

The experience of the 2018 sanctions offers several takeaways for policymakers:

• Unilateral measures are vulnerable to evasion without broad international support.
• Economic pressure must be paired with clear diplomatic objectives to avoid ambiguity.
• Monitoring mechanisms and secondary sanctions are essential to close loopholes.
• Sanctions should be flexible enough to adapt to shifting market conditions, such as volatile oil prices.

Understanding these dynamics can help shape a more effective approach if the United States chooses to re‑engage with Iran through economic tools.

For a deeper look at the official sanction framework, see the U.S. Treasury sanctions on Iran. Reuters documented the initial re‑imposition of sanctions in a May 2018 report, available at Reuters report on 2018 sanctions. The International Monetary Fund provides an analysis of Iran’s economy under sanctions here: IMF analysis of Iran’s economy. A Congressional Research Service brief outlines the legislative background at CRS report on Iran sanctions. The United Nations also maintains a sanctions regime, detailed at UN Security Council sanctions on Iran.