Why Iran’s Conditions for a US Deal Prompt Scrutiny of Blockade Legality, Sanctions Authority, and Third‑State Participation

Iran has communicated a set of conditions that it wishes to see incorporated into any prospective agreement with the United States, emphasizing that the removal of economic sanctions and the assurance of unhindered maritime passage are to be addressed before any substantive discussion of its nuclear programme is entertained. In particular, Tehran has insisted that the United States lift what it describes as a naval blockade imposed upon Iranian shipping, and that a fresh arrangement be negotiated to govern the use of the strategically vital Strait of Hormuz, thereby seeking to secure free movement of its vessels through this narrow maritime corridor. Alongside these demands, Iran has expressed a desire for Lebanon to be incorporated into the settlement, indicating that the Lebanese state would play a role in the broader regional framework envisaged by Tehran as part of the negotiated understanding with Washington. These articulated prerequisites collectively shift the focus of the prospective dialogue toward immediate relief of economic pressures and the restoration of maritime freedom, thereby relegating the resolution of long‑standing nuclear concerns to a secondary, later phase of any comprehensive accord between the two parties. By prioritising the cessation of what Tehran characterises as an unlawful maritime restriction and the annulment of punitive financial measures, Iran signals its expectation that any credible bargaining position by Washington must first address the tangible hardships imposed on its economy and commercial fleet. Consequently, the proposed terms, encompassing the removal of the blockade, the establishment of a new regime for navigation through the Hormuz corridor, and the inclusion of Lebanon, together constitute a comprehensive package that Tehran hopes will form the foundation for subsequent negotiations on its nuclear enrichment activities.

One question is whether the United States can lawfully impose a naval blockade against Iran without explicit authorization from the United Nations Security Council, given that international law traditionally reserves the right of blockade to belligerents acting in accordance with the law of armed conflict and to measures sanctioned by the collective security body. Perhaps the more important legal issue is whether such a unilateral maritime restriction complies with the prohibition on the use of force embodied in Article 2(4) of the United Nations Charter, which permits force only in self‑defence or when expressly authorized by the Security Council, thereby raising doubts about the legal foundation of the blockade in the absence of a defensive justification. A competing view may argue that the United States considers the blockade a legitimate exercise of its national security prerogative aimed at preventing the transfer of prohibited materials, yet such a claim would still need to withstand scrutiny under the principles of necessity and proportionality that govern any incidental use of force in international law.

Another question is whether the United States possesses the domestic legal authority to impose the sweeping economic sanctions that Tehran seeks to have lifted, given that such measures are typically enacted under the International Emergency Economic Powers Act and related executive orders, which grant the President broad discretion but also impose procedural requirements that may be subject to judicial review. Perhaps the more important legal issue is whether the continuation of such sanctions without a clear legislative mandate infringes upon the separation of powers doctrine, as courts may evaluate whether the executive branch has overstepped its statutory authority in imposing measures that significantly affect foreign commerce and diplomatic relations. A fuller legal assessment would require clarity on whether any United States sanctions regime implicated by Tehran's demands is subject to mandatory consultation with allied states under multilateral sanction coordination mechanisms, which could affect the legality of unilateral relief offers.

One further question is whether a new arrangement governing navigation through the Strait of Hormuz, as sought by Tehran, must comply with the principles of freedom of navigation enshrined in the United Nations Convention on the Law of the Sea, which obliges all states to permit innocent passage and transit passage through international straits, thereby limiting the scope of any bilateral restriction. Perhaps the more important legal concern is whether any such arrangement could be justified under the right of self‑defence if Iran argues that control over the strait is essential to its security, yet international law requires that self‑defence measures be necessary, proportionate and reported to the Security Council, which may constrain the legality of restrictive navigation regimes.

Another possible view is that the proposed inclusion of Lebanon in the settlement raises questions about the legal capacity of a third‑state to become a party to an agreement primarily negotiated between the United States and Iran, which under international law may require the consent of all parties and may invoke principles of treaty participation and the doctrine of accession. Perhaps the more important legal issue is whether Lebanon’s participation would subject it to any obligations or restrictions arising from the maritime and sanctions components of the deal, thereby potentially implicating its own domestic legal frameworks and international commitments, which would need to be examined for compatibility and enforceability.

In sum, the conditions articulated by Tehran intertwine complex questions of international maritime law, the lawfulness of unilateral sanctions and blockades, and the procedural mechanics of involving a third regional actor, all of which would likely invite scrutiny by international tribunals or judicial bodies tasked with ensuring compliance with the United Nations Charter and established treaty regimes. A fuller legal resolution would depend on whether the United States chooses to amend or withdraw its measures in accordance with its domestic legal authority and whether any subsequent agreement satisfies the substantive requirements of international law, thereby determining the enforceability and durability of the proposed settlement.