Executive Summary The U.S.–Iran interim arrangement announced in June 2026 seeks to reduce military tensions while creating a sixty-day diplomatic window for negotiations on Iran’s nuclear programme. As part of this framework, Washington has proposed limited sanctions relief through the phased release of frozen Iranian assets under Treasury oversight and escrow mechanisms intended to finance humanitarian purchases. The arrangement has been presented by the United States as a controlled form of humanitarian relief rather than an unrestricted financial concession. Treasury Secretary Scott Bessent has stated that released funds would remain under U.S. supervision and be directed toward food, medicine, and agricultural purchases. Iranian officials, however, have rejected this interpretation, insisting that frozen sovereign assets remain Iranian property and cannot remain subject to foreign political conditions. The financial debate extends beyond the technical management of escrow accounts. Public reporting indicates that Iran could gain access to an initial US$12 billion in frozen assets, while broader estimates suggest that approximately US$100 billion remains frozen globally. Even if humanitarian restrictions remain in place, greater fiscal flexibility could strengthen Iran’s economic resilience and strategic capacity over time. The central issue is therefore not humanitarian relief itself, but sequencing. If economic incentives are introduced before measurable progress is achieved on ballistic missiles, drone capabilities, proxy organisations, and regional security commitments, Washington risks weakening one of its principal sources of negotiating leverage. Secretary of State Marco Rubio’s subsequent consultations with leaders in the United Arab Emirates, Bahrain, and Kuwait demonstrated Washington’s awareness of these concerns. His visit sought to reassure Gulf partners that the interim arrangement should be understood as the first stage of a broader diplomatic process rather than as a comprehensive settlement. The success of the arrangement should ultimately be measured not only by its ability to reduce immediate hostilities, but by whether future negotiations integrate conventional military capabilities, financial transparency, and regional security concerns into a comprehensive diplomatic framework. Introduction Secretary of State Marco Rubio’s visit to Abu Dhabi, Manama, and Kuwait City shortly after the announcement of the U.S.–Iran interim arrangement reflected the central challenge facing American diplomacy in the Gulf. While Washington sought to reassure regional partners that diplomacy would strengthen regional stability, Gulf governments remained focused on concerns extending well beyond Iran’s nuclear programme. Their security calculations continue to be shaped by Tehran’s ballistic missile programme, expanding drone capabilities, proxy organisations, and the broader implications of sanctions relief. For Gulf states and Israel, immediate de-escalation is welcome. Yet many also question whether introducing economic incentives before measurable progress on missiles, drones, and proxy organisations may gradually reduce the leverage available during subsequent negotiations. The debate surrounding the Memorandum of Understanding signed in June 2026 illustrates this tension. Reports that approximately US$12 billion in frozen Iranian assets could become available under internationally supervised arrangements generated immediate political controversy. Washington insists that these funds would remain subject to Treasury oversight and humanitarian restrictions. Tehran rejects this interpretation and argues that sovereign Iranian assets cannot remain under foreign political control. These competing narratives show that the interim arrangement is not merely about sanctions relief. It reflects a broader debate over how diplomacy should be sequenced in a region where economic pressure, military deterrence, and political influence have become increasingly interconnected. Frozen Assets and the Sequencing Challenge The phased structure of the interim arrangement reflects a deliberate diplomatic strategy. Rather than attempting to negotiate every contentious issue simultaneously, Washington has chosen to reduce immediate military risks while postponing more politically difficult discussions. Confidence-building measures, humanitarian relief, and limited sanctions easing are intended to create conditions for sustained diplomacy. The financial dimension has nevertheless emerged as the agreement’s most contested component. Public reporting indicates that Iran could ultimately receive access to an initial US$12 billion in frozen assets, while estimates suggest that nearly US$100 billion in Iranian assets remain frozen worldwide. These figures illustrate both the scale of potential economic relief and the strategic importance attached to sanctions policy. Washington has argued that these funds will not become unrestricted cash transfers. Treasury Secretary Scott Bessent stated that released assets would remain under Treasury oversight through escrow arrangements and would primarily finance humanitarian purchases, including food, medicine, and agricultural commodities. President Donald Trump has similarly argued that sanctions relief should benefit the Iranian people while supporting American exports rather than providing unrestricted financial resources to Tehran. Iranian officials have publicly rejected this interpretation. Tehran insists that frozen sovereign assets remain Iranian property and that purchasing decisions cannot be dictated by foreign governments. Iranian officials have also disputed suggestions that the Memorandum of Understanding legally obliges Iran to purchase American goods, demonstrating that important disagreements remain over implementation despite agreement on the broader objective of reducing hostilities. The principal policy issue, however, is not only legal or technical. It concerns negotiating leverage. Economic incentives derive much of their strategic value from timing. When financial pressure is eased before agreements are reached on broader security issues, policymakers must consider whether the balance of incentives gradually shifts during subsequent negotiations. Even where humanitarian safeguards remain effective, greater fiscal flexibility may produce wider economic effects. Governments operate integrated budgets. External financing of civilian imports can reduce pressure on domestic public finances, freeing resources that would otherwise have been spent on food or medicine for other national priorities. Humanitarian funds may not directly purchase weapons, but broader economic relief can strengthen industrial production, procurement capacity, technological investment, and fiscal resilience. This process may contribute to what can be described as strategic regeneration: the gradual restoration of military, industrial, and economic capacity following prolonged sanctions. The concern is not that humanitarian assistance immediately finances military programmes, but that economic normalization may indirectly strengthen Iran’s ability to sustain missile development, drone production, defence industries, and regional partnerships over time. The sequencing challenge therefore lies at the centre of the interim arrangement. If future negotiations remain closely linked to measurable progress on broader security issues, phased diplomacy may strengthen regional stability. If economic incentives expand significantly before corresponding security commitments are secured, Washington risks reducing one of its principal sources of leverage while the most difficult issues remain unresolved. Regional Security Beyond the Nuclear File The interim arrangement has reduced the immediate risk of military confrontation, but it has not eliminated the strategic concerns that continue to shape Gulf and Israeli security calculations. Regional governments are not rejecting diplomacy as such. Their concern is whether future negotiations will address the conventional military capabilities that have transformed Iran into one of the Middle East’s most influential regional powers. Rubio’s visit to the United Arab Emirates, Bahrain, and Kuwait reflected Washington’s recognition of these concerns. His discussions emphasized that the Memorandum of Understanding should be understood as the beginning of a broader diplomatic process rather than as a comprehensive settlement. He further argued that lasting regional stability would require addressing Iran’s relationships with proxy organisations, maritime security, and the wider military posture that continues to influence regional deterrence. For the Gulf Cooperation Council, these concerns are practical rather than theoretical. Missile attacks against energy infrastructure, drone operations targeting strategic facilities, and repeated threats to commercial shipping have demonstrated the vulnerability of regional economies to asymmetric military capabilities. Gulf governments therefore evaluate the interim arrangement through the broader lens of long-term deterrence, not only short-term de-escalation. Israel views the agreement through a similar strategic lens. From Jerusalem’s perspective, the nuclear issue cannot be separated indefinitely from the cumulative effects of ballistic missiles, armed drones, precision-guided munitions, and Iran’s network of regional proxy organisations. Any durable diplomatic settlement must eventually encompass these conventional military capabilities if it is to produce lasting regional stability. The disagreement surrounding frozen Iranian assets reinforces these broader security concerns. While Washington insists that sanctions relief will remain subject to Treasury oversight and humanitarian restrictions, Iranian officials maintain that sovereign assets cannot remain under foreign political conditions. This unresolved dispute illustrates that financial governance has become inseparable from wider questions of regional security and strategic competition. Policy Implications Several policy considerations emerge from the interim arrangement. First, humanitarian assistance and regional security should be pursued simultaneously rather than viewed as competing objectives. Humanitarian access to food and medicine remains consistent with international norms, but effective oversight mechanisms are essential to preserve confidence among regional partners. Second, future negotiations should progressively integrate ballistic missiles, drone capabilities, and proxy organisations into the diplomatic agenda. These issues now represent the principal security concerns of Gulf states and Israel and cannot remain indefinitely separated from broader discussions on sanctions relief. Third, financial transparency should become a central component of implementation. Clear reporting procedures, independent oversight, and internationally verifiable compliance mechanisms would reduce uncertainty surrounding sanctions relief while strengthening confidence in humanitarian exemptions. Finally, policymakers should recognize that sequencing itself is a strategic instrument. Negotiations are shaped not only by the concessions eventually exchanged, but also by the order in which those concessions occur. Preserving the relationship between economic incentives and measurable security commitments will remain essential if diplomacy is to produce durable rather than temporary regional stability. Conclusion The U.S.–Iran interim arrangement should neither be viewed as a diplomatic breakthrough nor dismissed as a strategic concession. It represents the opening stage of a broader negotiating process whose long-term significance will depend on developments that have yet to occur. Its immediate achievement has been to reduce the likelihood of renewed military confrontation while creating political space for continued diplomacy. Yet the arrangement has also exposed continuing disagreements over sanctions relief, Treasury oversight, and the management of frozen Iranian assets. More importantly, it has highlighted uncertainty over how and when negotiations will address the conventional military capabilities that increasingly shape regional security. The debate surrounding the potential release of US$12 billion in frozen assets, against the backdrop of an estimated US$100 billion in restricted Iranian reserves worldwide, demonstrates that financial governance has become inseparable from wider questions of regional strategy. Rubio’s consultations with Gulf leaders further illustrated that regional confidence will ultimately depend less on humanitarian mechanisms than on whether future negotiations achieve measurable progress on ballistic missiles, drone proliferation, and proxy organisations. The central lesson of the interim arrangement is therefore one of strategic sequencing. Diplomatic success will not be determined solely by the pace of sanctions relief or humanitarian assistance, but by whether economic incentives remain aligned with meaningful progress on the military capabilities that continue to define the regional balance of power. If future negotiations integrate conventional capabilities, financial transparency, and credible verification into a comprehensive framework, the interim arrangement may serve as the foundation for a more durable regional security architecture. If these issues remain separated into successive negotiating tracks, however, the agreement risks becoming a temporary pause in a strategic competition whose underlying dynamics remain fundamentally unchanged.