Every negotiation that fails, fails on one thing. In the Iran war, that one thing is now precisely identified: uranium enrichment. Here is what each side has asked for, what each has offered, and what the gap between those positions actually requires to close.
What Iran Has Offered
One recent proposal from the Iranian side would involve a 10-year pause on enrichment, followed by another decade where Iran would agree to only enrich to levels well below weapons grade, according to a person familiar with the discussions.
This is a significant evolution from Iran’s earlier positions. At Islamabad round one, Iran initially proposed a 3-5 year enrichment suspension. The 10-year pause, followed by a decade of low-level enrichment, represents a doubling of the initial timeline — a genuine movement toward the US position, even if it falls short.
Iran’s 10-year offer also comes with other elements: Iran agreed to a “monitored process of down blending” — which is a process by which more dangerous, highly enriched uranium is mixed with natural or less potent uranium to create a less potent material. Down blending rather than surrendering material preserves Iran’s sovereignty claim while reducing the immediate proliferation risk.
What the US Has Demanded
During the first round of talks, American negotiators proposed a 20-year pause on Iran enriching uranium, a source familiar with the discussions said. Iran responded with a proposal for a five-year suspension, which the US rejected.
Trump said he was not pleased with the offer of a 20-year suspension of Tehran’s nuclear enrichment program made last weekend by his chief negotiator, Vice President JD Vance.
This is the critical revelation: Vance offered 20 years, and Trump publicly distanced himself from that offer. The US’s internal position is therefore more demanding than the 20-year suspension its own negotiating team put on the table. Trump’s stated position — “zero enrichment, indefinitely” — is not a negotiating position from which he can easily retreat without appearing to have capitulated.
The Scale of Iran’s Nuclear Stockpile
The International Atomic Energy Agency has estimated that Iran has nearly 1,000 pounds of highly enriched uranium, enough for 11 nuclear weapons.
That stockpile — buried in underground facilities at Fordow, Natanz and Isfahan, some of it surviving US-Israeli strikes — is the physical reality that sits behind every abstract negotiating position. The US wants it out of Iran entirely. Iran wants to retain it under international monitoring. Russia has offered to take it into custody. Trump has reportedly rejected Putin’s offer, not wanting to give Moscow that leverage.
What Could Bridge the Gap
Three possible bridges exist between “10-year pause” and “zero enrichment indefinitely”:
The Russia custody solution: If Iran’s enriched uranium is physically removed to Russia, both sides can claim their position was met — Iran hasn’t given it to the US, and the US can say it’s no longer in Iranian hands. Trump’s rejection of this option remains the key obstacle.
The “civilian nuclear only” framing: Secretary of State Rubio has said Iran can have a civilian nuclear energy programme — just not a weapons one. A framework that permits low-level enrichment for domestic power generation, under full IAEA access, while prohibiting anything above 5% enrichment, could be framed as “zero weapons enrichment” by Trump and “retained civilian programme” by Iran.
The phased verification deal: A 10-year suspension with automatic extension triggers if IAEA access is maintained, and automatic reimposition of military options if it is violated. This gives Trump the “indefinite” framing he needs (it extends automatically) while giving Iran a defined initial period.
Araghchi’s return to Islamabad tonight, with fresh instructions from Tehran, is the next opportunity for one of these bridges to be formally proposed.
