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CNN  — 

Efforts to revive the Iran nuclear deal have again hit a snag as US officials charge that Tehran’s latest response signals that it is not ready to return to an agreement in the immediate future as it has failed to cooperate on a probe into traces of undeclared nuclear material.

The United States and Iran have traded responses via the European Union to a proposal put forward by the EU’s top diplomat, Josep Borrell. Iran submitted its initial answer in mid-August; the US replied to it about a week later.

Last Thursday, Iran sent its latest answer, which a State Department spokesperson said was “not constructive.”

On Monday, Borrell said he was “less confident” about prospects for the nuclear deal, from which the US withdrew in 2018 under the Trump administration. Iran has increasingly violated its commitments to the agreement and grown its nuclear program in the wake of the US withdrawal.