Earlier, a US official said the meeting between Blinken, Le Drian, Britain's Dominic Raab and Germany's Heiko Maas would also cover the coronavirus pandemic, Russia, China, Myanmar and climate.
"A few minutes ago, the process of producing 20% enriched uranium has started in Fordow enrichment complex," Iran said Monday.
Three mysterious incidents, linked by explosions – at least two of them at secretive nuclear and weapons facilities – have rocked Iran in the past week.
Criss-crossed by several major fault lines, Iran is one of the most earthquake-prone countries in the world.
At the time the IAEA bristled at being told what to do, saying it does not take information presented to it at face value and sends inspectors "only when needed."
Iran already warned in July 2018 that uranium production would increase following the construction of an advanced factory, which would be ready in 10 months.
Salehi did not elaborate on his remark about stockpiles. Iran's reserve of 20 percent enriched uranium was downblended, shipped abroad or turned into fuel plates for a research reactor after deal.
Revolutionary Guard Commander: Our 2000 km ballistic missle range is enough to harm our enemies
The acquisition would not violate Iran's landmark 2015 deal with world powers over its disputed nuclear program as the deal did not set limits on the Islamic Republic's supplies of uranium ore.
Amos Yadlin noted that one of the current problems with Iran's nuclear-related dynamics is that neither the Iran nuclear deal nor UNSC Resolution 2231 actually ban Iranian missile testing.