The Flag Was the Lever: Iran’s Tanker Fleet and Maritime Sanctions
Maritime sanctions have long been a tool of international diplomacy and national security. However, their effectiveness depends on more than restricting trade or designating vessels. The countries under whose flags ships operate play a critical role in determining how those vessels are registered, monitored, inspected, and held accountable. As sanctioned vessels move between registries, governments face ongoing challenges in maintaining transparency and meaningful oversight of maritime activity.
In two new publications, Eric R. Dawicki examines the relationship between flag-state administration, maritime sanctions, and U.S. foreign policy through the history of Iran’s tanker fleet. Drawing on publicly available sanctions data, historical records, and his firsthand experience in international maritime administration, Dawicki explores how the United States has approached enforcement against Iranian maritime trade, where those efforts have encountered limitations, and what alternative approaches may have been available.
Central to his analysis is a 2015 proposal to register vessels operated by the National Iranian Tanker Company under a U.S.-administered ship registry with enhanced transparency and compliance requirements. Although the arrangement did not receive the necessary U.S. authorization, Dawicki argues that the experience offers important lessons about the potential role of flag states as instruments of diplomacy, regulatory oversight, and national security.
COPE° is pleased to share both the full monograph and its accompanying brief, providing readers with two ways to explore the findings, historical context, and policy recommendations.
THE MONOGRAPH
The Flag Was the Lever: Iran's Tanker Fleet, Flag States and the Instrument the United States Left Unused
The full monograph provides an in-depth examination of Iran’s tanker fleet and the role of flag-state administration in maritime sanctions enforcement from 2012 through 2026. It presents historical analysis, comparative vessel registration data, an account of the 2015 monitored-flag proposal, and an examination of the legal, commercial, and diplomatic considerations involved.
The monograph also outlines policy recommendations aimed at strengthening maritime transparency, improving coordination among U.S. agencies, and exploring how appropriately authorized flag-state monitoring arrangements could support future sanctions and diplomatic agreements.
Explore the full monograph below.
THE BRIEF
The Flag Was the Lever: What Iran's Tanker Fleet Teaches About Sanctions at Sea
The accompanying brief offers a more concise examination of the monograph’s central findings and recommendations. It highlights the concentration of sanctioned Iranian tankers under certain foreign flags, the limitations of existing enforcement approaches, and the potential value of greater transparency through flag-state oversight.
Designed for readers seeking a focused overview, the brief summarizes the principal arguments and policy considerations while directing those interested in the supporting evidence and historical detail to the full monograph.
Explore the brief below.
Together, these publications invite further discussion about how maritime governance can contribute to more effective sanctions policy, greater international accountability, and the development of diplomatic tools that extend beyond traditional enforcement measures.
About the Center for Ocean Policy and Economics
The Center for Ocean Policy and Economics (COPE°) is the maritime policy research center of Northeast Maritime Institute in Fairhaven, Massachusetts. COPE° conducts research and develops policy proposals on maritime safety, security and environmental protection, including workforce development, vessel registration, shipbuilding capacity, and the economics of the American maritime industry and the International maritime industry. In 2022, COPE° entered into an agreement with the Government of the United States Virgin Islands to pursue development of an international, U.S.-affiliated open ship registry domiciled in the territory.
About Northeast Maritime Institute
Northeast Maritime Institute provides maritime education and professional training through classroom instruction, simulation, practical training, sea-service experience and digital learning. In 2026 the U.S. Maritime Administration designated NMI a Center of Excellence for Domestic Maritime Workforce Training and Education under 46 U.S.C. § 51706. At the center of the Institute’s mission is a single principle: Honor the Mariner.
For questions or comments, please email [email protected].
The Flag Was the Lever: Iran’s Tanker Fleet and Maritime Sanctions Read More »






















