US and Iran Exchange Nuclear Formulas as Pentagon Investigation Into Girls' School Strike Nears Completion
In a significant diplomatic development, the United States and Iran exchanged concrete nuclear proposals for the first time since negotiations resumed, while a Pentagon probe into a controversial strike on an Iranian girls' school approaches its conclusion.
The United States and Iran exchanged what officials described as concrete "formulas" for constraining Tehran's nuclear program during talks mediated by Oman on 20 May 2026, the first such direct exchange of written proposals since the current round of negotiations began. The development was disclosed hours before a Pentagon investigation into a strike on an Iranian girls' school near Isfahan appeared to reach its final stages.
The twin developments signal a dual-track approach from Washington: engagement on the nuclear file proceeding alongside accountability for military actions that have drawn scrutiny from both Congress and international observers. Oman has played the role of intermediary throughout the current negotiating process, carrying documents and formulations between delegations that have no direct diplomatic contact.
A US admiral involved in the probe told reporters on 20 May 2026 that the investigation into the March strike on the school—reportedly a site used for music instruction— was nearing its conclusion. The Pentagon has previously acknowledged the strike but has not publicly attributed responsibility for it. The proximity of the probe's completion to the nuclear formula exchange raises questions about whether the two tracks were managed as part of a single strategy or represent parallel processes that happened to converge.
The Jerusalem Post reported on 20 May 2026 that coordination between the US military and the Israel Defense Forces has been extended, a separate development that complicates the diplomatic picture. Any assumption that US engagement with Iran automatically signals reduced pressure from other quarters appears premature. The extended military coordination suggests Tel Aviv and Washington have maintained their strategic consultation even as talks in Muscat advanced.
The nuclear formula exchange represents the most substantive movement on the Iranian nuclear question in recent memory. Previous rounds had produced general statements of intent; the latest talks produced draft textual proposals that both sides could respond to formally. Whether those proposals represent genuine convergence or positions designed to test the other's底线 remains unclear.
The pipeline dispute underscores a structural tension that runs through the broader multipolar framework Beijing and Moscow have sought to present as a counterweight to Western dominance. When the interests of the two principal partners diverge in practice, the partnership's resilience is tested in ways that rhetorical alignment cannot resolve. Chinese officials did not publicly address the pipeline negotiations, a silence that carries its own signal in the context of a relationship that both sides have invested heavily in presenting as strategic rather than transactional.
What comes next depends on whether the formula exchanges produce sufficient common ground to justify a further round of negotiations or whether both sides use the pause to consolidate positions already staked out. The probe's conclusion will provide one data point; the trajectory of the nuclear talks will provide another. A resolution that satisfies neither party's domestic political constraints remains the most probable near-term outcome. The sources do not specify what specific concessions each side offered in the formula exchange, leaving open the question of what Washington demanded and what Tehran was prepared to concede in return.
Wire provenance
This editorial synthesis draws on the following public wire/social posts:
- https://t.me/The_Jerusalem_Post/138491
- https://t.me/TSN_ua/89231