Iran is breaching the deal's limits on its nuclear activities step by step in response to Washington's withdrawal from the accord last year and its renewed sanctions on Teheran. Tehran says it can quickly undo those breaches if Washington lifts its sanctions.

In a quarterly report, the International Atomic Energy Agency who is policing the deal, said Iran's reserve of enriched uranium and the purity to which it is refined are above the deal's limits. Tehran is also enriching with more advanced centrifuges and enriching at Fordow, which the deal forbids.