Iran's Foreign Ministry Spokesperson Saeed Khatibzadeh said at the ministry's weekly press conference on Monday that the Iranian negotiating team will again head to Vienna tomorrow to resume the talks, following consultations in Tehran.

The US, Khatibzadeh said, is expected to resume honoring its JCPOA commitments with a clear agenda, adding that no conceivable breakthrough will take place unless it happens by way of a political decision in Washington.

The spokesperson also said that the US and the E3 must prove that they are reliable actors in the international system. 

The eighth round of the talks, and their longest one yet, began on December 27 and was focused on the removal of all unilateral sanctions imposed by the US following its withdrawal from the JCPOA in 2018. 

A European official, speaking on condition of anonymity, said that the Vienna talks would likely be resumed Tuesday.