Iran has once again warned that if European parties to the 2015 nuclear agreement fail to meet their commitments to the Islamic Republic under the deal, Tehran will further, and this time more decisively, reduce its nuclear obligations.

“The third step will be heavier than the first and second ones so it can strike a balance between the Islamic Republic’s rights and obligations in the JCPOA,” Ministry Spokesman Abbas Mousavi told the Islamic Republic of Iran Broadcasting News Agency in remarks that the outlet reported on Sunday. He was referring to the nuclear deal by the acronym of its official title, the Joint Comprehensive Plan of Action.

The third round has already been devised and is implementable, he added.

Iran initiated a first round of nuclear countermeasures in May, in reaction to the United States withdrawal from the JCPOA a little over a year ago.

PressTV-Iran: No talks with US unless it returns to nuclear deal

Iran’s deputy foreign minister has ruled out any possibility of negotiations with the US unless it returns to the 2015 nuclear deal.

The move was aimed at prompting the deal’s European signatories to live up to the commitment they have undertaken under the deal to satisfy Iran’s business interests.

As a first step, Iran increased its enriched uranium stockpile to beyond the 300-kilogram cap set by the agreement.

The Islamic Republic took the second step two months later, which saw it beginning enrichment of uranium to purity rates beyond the JCPOA limit of 3.76 percent.

Mousavi said Iran was enacting the responses at the same time as it was giving diplomacy a chance, referring to ongoing communication between Iran and France, which has reportedly come up with proposals aimed at saving the nuclear accord.

The third step will come if the European side fails to display the will to keep the deal in place, the spokesman said. However, if they meet their obligations, Iran will decide against taking the third step and even roll back some of the measures it has already taken, he added.

US cannot bar Iran FM from UN

Separately, Mousavi said although Washington has sanctioned Foreign Minister Mohammad Javad Zarif, it is not legally permitted to bar foreign top diplomats and presidents from the upcoming UN General Assembly meeting in New York.

PressTV-By sanctioning Zarif, US forfeited right to diplomacy: Iran

The Iranian administration says by targeting Iran’s foreign minister with sanctions, the US has forfeited its right to engaging diplomatically with the Islamic Republic.

He said the US slapped the sanction against Zarif to trouble his presence at the meeting among other things.

The spokesperson, however, noted, “If conditions evolve favorably, Mr. Zarif and his delegation’s trip will take place and his active diplomacy will be pursued in New York and on the side lines of the General Assembly as well as inside the United Nations [itself].”