• Secretary of State Marco Rubio demands Iran immediately open the Strait of Hormuz as a precondition for broader nuclear negotiations.
  • Iran has signaled conditional openings, but the U.S. rejects any arrangement that gives Tehran control over international waterways.
  • Talks could proceed in two phases: Hormuz transit first, then disposal of highly enriched uranium.

Rubio Sets a Red Line

Secretary of State Marco Rubio delivered a stark ultimatum on Thursday: Iran must open the Strait of Hormuz and keep it open, without conditions, before any wider nuclear talks can begin.

“Condition No. 1 is that Iran opens the Strait of Hormuz,” Rubio said in a press briefing. “They have to announce very clearly that the strait is now open.” His remarks come amid renewed diplomatic efforts that have so far failed to resolve a crisis over the crucial oil chokepoint.

Iran has floated conditional or temporary reopening measures in recent weeks, according to people familiar with the matter, linking transit to sanctions relief and nuclear concessions. But the U.S. has rejected any proposal that would allow Tehran to dictate the strait’s status.

“Iran has also to commit to specific negotiations on the disposition of highly enriched uranium,” Rubio added, signaling that Washington seeks a two-step deal: immediate and verifiable Hormuz passage, followed by talks on dismantling parts of Iran’s nuclear program.

Negotiators from both sides have described the framework as “in a very good place” but not yet signed, as reported in early May. However, the sticking point remains governance of the strait. U.S. officials insist on non-discriminatory, rules-based transit under international law, while Iran seeks to maintain leverage by tying access to other issues.

Market and Diplomatic Fallout

The Strait of Hormuz is a critical artery for global oil shipments, and any threat to its closure sparks immediate price volatility. The latest rhetoric has kept energy markets on edge, though no major supply disruptions have materialized. Analysts warn that a prolonged standoff could unsettle shipping insurers and Gulf allies.

“What institutional investors like us are really focused on is regulatory stability,” said a European-based fund manager, echoing concerns about geopolitical risk. “This is one of those moments where clarity is paramount.”

Next Steps

Diplomatic channels remain open, with both sides signaling a willingness to move forward if terms align. But Rubio’s uncompromising language suggests a transactional approach: Iran must act first on Hormuz, then negotiate on uranium. Whether Tehran accepts that sequence remains the open question.

*Correction: An earlier version of this article misstated the timeline of Iran’s offers. The conditional reopening proposal was first floated in April 2026.