Iran's nuclear enrichment facility in Natanz, 300 kilometers south of the capital Tehran (Photo: AFP/ VNA)

In an interview with Reuters on Thursday, Rafael Grossi, who heads the IAEA that polices Iran's compliance to the 2015 nuclear deal, said there had been too many breaches by Iran for the agreement to simply snap back into place when US President-elect Joe Biden takes office next month.

Kazem Gharibabadi, Iran’s ambassador to IAEA in Vienna said presenting any assessment on how the commitments are implemented is absolutely beyond the mandate of the agency and should be avoided.  Biden has said the United States will rejoin the deal "if Iran resumes strict compliance."