According to a confidential International Atomic Energy Agency report, Iran added 7.5 kilograms—about 16.5 pounds—of 60% enriched uranium in the three months to August, far less than the 51.8 kilograms it added in the previous six months.

The more slowly Tehran accumulates highly enriched uranium, the less potential fissile material it has for nuclear weapons.

The decision to curtail its accumulation of highly enriched uranium, which can be turned into weapons-grade fissile material in a matter of days, isn’t a significant change to Tehran’s nuclear program. It already has 121.6 kilograms of 60% enriched uranium, enough for at least two nuclear weapons. Iran has also produced enough lower-grade fissile material to fuel several other weapons. The IAEA reports—it released two on Monday—also made clear that Tehran continued not to cooperate with the agency on other significant issues.

However, slowing the buildup of 60% enriched uranium moves in the direction of a key request from Washington as part of indirect talks between Iran and the U.S. aimed at de-escalating tensions between the two countries earlier this year. The Biden administration was pushing for Iran to stop adding to its 60% stockpile.

The amount of 60% enriched uranium added to Tehran’s stockpile in the quarter to August was the second lowest since Iran started gearing up its highly enriched uranium production in the spring of 2021.

Iran has hugely expanded its nuclear program over the past four years following the decision by the Trump administration to take the U.S. out of the 2015 nuclear deal, which placed strict but temporary controls on Tehran’s nuclear work in exchange for lifting a swath of international sanctions.

In April 2021, Iran started producing 60% enriched uranium, becoming the only nonnuclear country to do so.

Iran insists its nuclear program is for purely peaceful, civilian purposes. U.S. officials have said they believe it would take Iran several months to produce some kind of nuclear weapon although they say there is no evidence Tehran has resumed work on producing an actual nuclear weapon.

The Wall Street Journal reported last month that Iran had started slowing its accumulation of 60% enriched uranium and had potentially started reversing course by diluting a small amount of the material. While the pace of production of fissile material can fluctuate for a number of reasons, the decision to dilute material was a clear sign Tehran was intending to slow its buildup of the material.

The IAEA said on Monday that Iran had diluted to 20% enriched uranium 6.4 kilograms of the 60% material in July.

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