I don't get it. The Ruskies inrich the uranium, where it is sent back to Iran..for insertion in nuclear warheads.
What does this solve? Who cares where the uranium is enriched as long as ends up back in Tehran?
The scheme is based on the fact that power reactor fuel
is low enriched (2-3%) whereas weapons grade fuel is
90+% U235.
Nuclear fuel for light water reactors can not be inserted into warheads to make anything more then a dirty bomb. Enriched Uranium isotopes for nuclear weapons are a tiny fraction of what's in the rods (less then 1%) and very difficult to seperate out from the radioactive junk.