Tehran rules out the possibility of concluding any preliminary agreement on the resumption of the implementation of the Iranian nuclear deal (JCPOA) during the talks in Vienna, said the official representative of the Iranian Foreign Ministry Saeed Khatibzadeh.

No initial agreement on the restoration of the JCPOA will emerge from the negotiations in Vienna, he said, quoted by the Iranian Tasnim news agency. 

The Islamic Republic's Foreign Ministry spokesman added that no agreement will be reached unless all Tehran's conditions are met.

Khatibzadeh confirmed that in Vienna three separate working groups are still dealing with the relevant issues. 

According to him, a significant percentage of unresolved problems have already been addressed in these groups, but some issues require political solutions.

Talks are underway in Vienna on the return of the United States and Iran to the JCPOA. Previous American President Donald Trump made the decision in 2018 to withdraw from the nuclear deal. The JCPOA was signed with Iran by the five permanent members of the UN Security Council and Germany in 2015 with the aim of resolving the crisis around the nuclear development of the Islamic republic.

The current President of the United States, Joe Biden, has repeatedly signaled his readiness to return the United States to the JCPOA. Iranian President Hassan Rouhani warned on March 2 in a telephone conversation with his French counterpart Emmanuel Macron that the only way to preserve the JCPOA is to lift Washington's sanctions against Tehran.