As the United States and Iran signal that a ceasefire agreement could be finalized as early as this weekend, one issue continues to dominate negotiations: the future of Iran’s stockpile of highly enriched uranium.

Washington says any agreement must result in Iran’s enriched uranium being removed and destroyed, while Tehran insists that uranium enrichment is a sovereign right protected under international agreements. The disagreement highlights the core challenge that has shaped years of diplomacy over Iran’s nuclear program.

Although officials on both sides have expressed cautious optimism about reaching a broader agreement, conflicting public statements suggest significant differences remain over the final terms.

TL;DR

• The U.S. says a proposed agreement would remove and destroy Iran’s highly enriched uranium.
• Iran maintains that uranium enrichment is its sovereign right under international law.
• Reports suggest the draft agreement could also address regional security issues beyond Iran’s nuclear program.
• Iran has reportedly reinforced storage sites containing highly enriched uranium.
• Russia has again offered to store Iranian uranium as part of a broader settlement.
• No final agreement has been officially confirmed by either side.

Why is enriched uranium the main sticking point?

Enriched uranium has long been at the center of international concerns over Iran’s nuclear program.

Natural uranium contains only a small percentage of the fissile isotope uranium-235. Through enrichment, that concentration is increased for various purposes.

Lower levels of enrichment are commonly used to fuel civilian nuclear power plants.

However, uranium enriched to much higher levels significantly shortens the technical pathway toward producing weapons-grade material if a country decides to pursue nuclear weapons.

Because of this, negotiations have focused not only on whether Iran can enrich uranium, but also:

• How much uranium it can possess?
• The maximum enrichment level allowed.
• Where enriched uranium should be stored.
• Who monitors compliance.
• How quickly any stockpiles could be removed if an agreement is violated.

What does the United States want?

According to reports citing a senior U.S. official, the emerging memorandum of understanding (MoU) would require Iran’s stockpile of highly enriched uranium to be destroyed and removed from the country.

The official reportedly said:

• Highly enriched uranium would be destroyed on-site before removal.
• Iran’s nuclear infrastructure would be dismantled under the agreement.
• The proposed deal could extend beyond nuclear issues to include regional security matters, including Lebanon.
• Negotiators believe there is a strong possibility that an agreement could be finalized if the remaining issues are resolved.

The United States has consistently argued that limiting Iran’s access to highly enriched uranium is essential to preventing nuclear weapons proliferation.

What is Iran’s position?

Iran has repeatedly stated that uranium enrichment is a legitimate sovereign right under the Nuclear Non-Proliferation Treaty (NPT).

Iranian officials maintain that:

• Their nuclear program is intended exclusively for peaceful purposes.
• Domestic enrichment is necessary for civilian nuclear activities.
• Any agreement must recognize Iran’s right to enrich uranium.

Iran has also rejected reports suggesting a final agreement has already been approved, with state-linked media emphasizing that negotiations are still ongoing and no agreed text currently exists.

Reports of fortified uranium storage sites

Al Jazeera also reported that Iranian Supreme Leader Mojtaba Khamenei stated that highly enriched uranium must not be shipped abroad.

The reported measures include:

• Sealing tunnel entrances.
• Collapsing access routes.
• Installing explosive barriers around storage locations.

If accurate, these steps could complicate any future effort to remove or verify the country’s uranium stockpile under an international agreement.

Neither side has publicly confirmed the operational details of these reported security measures.

Could another country hold Iran’s uranium?

One proposal discussed in previous rounds of diplomacy involves transferring Iran’s enriched uranium to a third country.

Russia has repeatedly indicated it would be willing to store Iran’s enriched uranium under international supervision if doing so helped secure a broader agreement.

Some media reports have also suggested that Iranian officials have explored transferring part of the country’s 60% enriched uranium stockpile abroad.

However, other reports indicate influential voices within Iran oppose sending highly enriched uranium outside the country, illustrating the political sensitivity surrounding the issue.

Why does uranium enrichment matter so much?

The dispute extends beyond technical nuclear issues.

For the United States and its allies, reducing or eliminating Iran’s stockpile lowers the risk of rapid nuclear weapons development.

For Iran, retaining enrichment capabilities has become a matter of national sovereignty, technological achievement, and strategic leverage.

As a result, control over enriched uranium has become both a security issue and a political symbol, making compromise particularly difficult.

What happens next?

Officials from both countries have suggested that negotiations are progressing, but substantial differences remain.

If an agreement is reached, implementation would likely require:

• Verification by international nuclear inspectors.
• Clear procedures for handling enriched uranium.
• Timetables for dismantling or limiting nuclear activities.
• Monitoring mechanisms to ensure compliance.
• Political approval from both governments.

Until a final text is formally announced, the fate of Iran’s enriched uranium remains one of the most consequential unanswered questions in the negotiations.