• Kremlin says Putin’s offer to take custody of Iranian enriched uranium remains valid but has not been acted upon.
  • Iran refuses to ship its stockpile abroad, the U.S. rejects Russian custody, and the IAEA lacks access to verify Iran’s material.
  • The initiative, part of efforts to ease nuclear tensions, faces a three-way deadlock with no near-term breakthrough.

Fragile Prospects

The Kremlin reiterated this week that President Vladimir Putin’s proposal for Russia to receive Iranian enriched uranium remains on the table, but the plan has yet to gain traction, according to people familiar with the matter. First floated in 2025, the initiative is aimed at breaking the nuclear impasse between Tehran and Washington by transferring Iran’s higher-enriched uranium to Russian custody. Kremlin spokesman Dmitry Peskov said the offer “still stands” but “has not been acted upon.”

Iranian officials, however, have shown little willingness to compromise. On September 25, Reuters reported that an Iranian official said Tehran would not agree to ship its highly enriched uranium out of the country—one of Washington’s central demands. Iran insists on its right to enrich uranium domestically and views the stockpile as a sovereign asset.

The United States has also rejected the idea of Russian custody, according to Kremlin and media reports. Western governments remain skeptical of Moscow’s role as a neutral custodian, especially given strained relations. The United Nations dimension is equally contentious: Russia and China vetoed a September 17 Security Council resolution that would have extended the mandate of independent experts monitoring Iran sanctions. The sanctions themselves remain in force, but the veto has reduced independent monitoring capacity.

The International Atomic Energy Agency (IAEA) has not been able to verify Iran’s enriched-uranium stockpile since June, when it lost continuity of knowledge due to halted inspections. The agency had previously verified 440.9 kg of uranium enriched up to 60% U-235—well below the roughly 90% considered weapons-grade, but far above typical civilian reactor fuel. The verification gap has raised proliferation concerns and complicates any potential deal.

A History of Proposals

The idea of Russia taking custody of Iranian uranium is not new. Under the 2015 Joint Comprehensive Plan of Action (JCPOA), Iran agreed to reduce its enriched-uranium stockpile in exchange for sanctions relief. Russia has previously participated in arrangements involving Iranian nuclear material, giving Moscow a claim to technical capacity. But the current proposal faces a far more difficult environment: the U.S. withdrew from the JCPOA in 2018, Iran has since expanded enrichment beyond accord limits, and military strikes on Iranian nuclear facilities in mid-2025 further damaged diplomacy.

“What institutional investors like us are really focused on is regulatory stability,” said Andrea Valeri, Blackstone (BX)’s country chairman for Italy, at a recent conference in Milan—a reminder that geopolitical risk can ripple through energy and financial markets. While the uranium proposal is not a corporate event, it carries implications for oil markets, sanctions, and the nuclear-fuel sector. A credible agreement could lower Middle East risk premiums and potentially allow Iran to export more oil. Conversely, failure preserves risk premiums tied to conflict and sanctions.

The Road Ahead

For the proposal to move forward, three conditions would need to be met: Iran must consent to export or custody arrangements; the U.S. and European partners must accept Russia’s role or agree to an alternative; and the IAEA must gain access and verification authority. None of these are currently in place. Iran’s refusal to ship its stockpile abroad remains the most immediate obstacle.

In the longer term, a Russian-custody arrangement could become relevant if negotiations shift toward a phased deal involving verified transfers, restored inspections, and calibrated sanctions relief. But a storage deal alone would not resolve core disputes over Iran’s enrichment rights, the duration of restrictions, and regional security concerns. The IAEA’s verification gap is likely to remain the central technical issue.

As of now, the initiative appears to be diplomatic leverage rather than an operational plan. The direct market effect of the latest Kremlin statement is likely limited unless Washington, Tehran, and the IAEA signal an agreed framework. The larger variable remains whether the nuclear dispute escalates or produces a verified settlement.

Correction: An earlier version of this article misstated the date of the Reuters report. It was September 25, not September 24.