And aside from seeking leverage with the other signers of the JCPOA, I'm sure they're looking for leverage....especially with the Euro Group who were primary customers for oil shipments before Trump sanctions.I had not considered that Iran was exporting their nuclear materials. I can see where, even unintentionally, they would now have a stock pile.
I assume, like any manufacturing process, there is a certain amount of lead time needed to produce the materials for delivery on a certain date.
I can see where they may have had or anticipated orders when the sanctions hit. They can’t simply switch the machines off and stop production.