VIENNA (AP) — In a defiant move ahead of nuclear talks, Iran has announced plans to vastly increase its pace of uranium enrichment, which can make both reactor fuel and the fissile core of warheads. Eager to avoid scuttling those negotiations, world powers are keeping their response low-key.

Iran told the International Atomic Energy Agency of its intentions last week, and the IAEA informed member nations in an internal note seen by The Associated Press on Thursday.

The brief note quoted Iran as saying new-generation IR2m "centrifuge machines ...will be used" to populate a new "unit" — a technical term for an assembly that can consist of as many as 3,132 centrifuges.