“We will not be going to Vienna for new negotiations but to finalize a nuclear agreement,” Foreign Ministry spokesman Saeed Khatibzadeh told reporters on Monday in Tehran.
However, Iran said there were still outstanding issues on which it was waiting for the US to settle.
“At the moment, we do not yet have a definitive answer from Washington,” Khatibzadeh said.
“If Washington answers the outstanding questions, we can go to Vienna as soon as possible.”
Iran has been engaged in long-running negotiations in the Austrian capital to revive the deal, known formally as the Joint Comprehensive Plan of Action (JCPOA), with Britain, China, France, Germany and Russia directly, and the United States indirectly.
The JCPOA gave Iran sanctions relief in exchange for curbs on its nuclear program. The US unilateral withdrawal from the accord in 2018 under then-president Donald Trump and the reimposition of tough economic sanctions prompted Iran a year later to begin rolling back on its own commitments in retaliation.
Among the sticking points is Tehran’s key demand to remove the Islamic Revolution Guards Corps from the US list of “terrorists”.
Khatibzadeh further said the Vienna talks have come to a grinding halt because of such an American approach.
“The United States is trying to hold the remaining issues hostage to its internal affairs. We will not wait forever … The United States must make a political decision,” he said.
“The US is responsible for the current pause in the talks and its [possible] protraction in the coming days. The solution is in the White House. [The US] must respond logically to Iran’s rational demands, which have been approved by the P4+1 group of countries, so that we can go back to Vienna,” the Iranian diplomat added, according to Press TV.
On Wednesday, the US Treasury announced measures targeting several entities it accused of involvement in procuring supplies for Iran's ballistic missile program, AFP reported.
A day later, Khatibzadeh said Washington’s imposition of the fresh sanctions on the Islamic Republic showed its “ill will” toward Iran.
On Monday, Khatibzadeh leveled further criticism at the US.
“Today, in the final phase, the United States seeks to deprive Iran of the economic benefits of the agreement,” Khatibzadeh said.
On Sunday, Iran’s Foreign Minister Hossein Amir-Abdollahian said an agreement was “close”, during a phone conversation with UN Secretary-General Antonio Guterres.
“We have passed on our proposals on the remaining issues to the American side through the EU senior negotiator, and now the ball is in US court,” Iran’s top diplomat said.