NEWS
A deal born fragile: the US-Iran peace between coercion and non-bound third parties
18 June 2026 — United States · Iran · UN
The facts
On 17 June 2026 Donald Trump signed the memorandum of understanding with Iran at Versailles — already signed virtually on the 15th — with a formal ceremony set in Switzerland on the 19th. The 14-point text declares the «immediate and permanent» termination of military operations «on all fronts, including Lebanon», the lifting of sanctions, the unfreezing of Iranian funds and the end of the naval blockade, and defers a final deal to within 60 days. Yet two shadows remain: Israel, a belligerent on the Lebanese front, is not a signatory and Netanyahu has distanced himself; and Trump has threatened to seize Iran's enriched uranium by force should negotiations fail.
Legal comment
Two structural defects, not political ones. First, coercion: the UN Charter (Art. 2(4)) prohibits even the mere threat of force, and the Vienna Convention on the Law of Treaties (Art. 52) makes void a treaty whose conclusion was procured by the threat or use of force. A pact signed while threatening to seize the uranium is flawed at its root. Second, third parties: under the principle pacta tertiis nec nocent nec prosunt a treaty does not bind those who do not sign it — so the promise of peace «including Lebanon» does not bind Israel, which keeps fighting on that front.
Implications
Voidness for coercion exists on paper, almost never in fact: no court declares it on its own motion and, against a great power, it stays a dead letter. It is the snapshot of the rules-based order when force overrides it — the rule exists, but it does not bind those with the means to ignore it. An announced peace is not a legally guaranteed peace.
Sources: NPR (testo MoU) · NBC News · CNN · Al Jazeera
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