Foreign Minister Hossein Amir-Abdollahian says the West has to understand that Iran does not tolerate "any language of threat" against it.
"We are [acting] on the basis of good faith and initiative, and are seeking the conclusion of a good agreement, but do not brook the language of threat under any circumstances," he told United Nations Secretary-General Antonio Guterres during a telephone call on Wednesday.
The Western side has to understand that application of such discourse against Iran always "produces the opposite result," the top diplomat added.
The remarks came as Iran and the P4+1 group of countries that comprises the UK, France, Russia, and China plus Germany, have been holding several rounds of talks in the Austrian capital.
The talks are aimed at examining the prospect of removal of the sanctions that the United States returned against Tehran in 2018 after leaving a historic nuclear agreement between Iran and the above countries.
Amir-Abdollahian repeated the Islamic Republic's assertion that the country does not accept any commitments beyond the 2015 nuclear deal.
He expressed regret that "the lack of initiative" on the part of the Western side had slowed down the negotiation process, while the Iranian side has come up with "some good proposals" that could form the basis of a lasting agreement.
The UN chief, for his part, considered the Vienna talks to be important, and repeated the world body's support for the nuclear deal.
He also expressed gratitude towards Tehran for its cooperation with the International Atomic Energy Agency (IAEA).
Iran's recent measure to allow the UN nuclear watchdog to set up new cameras at a the TESA Karaj Complex, a centrifuge component manufacturing workshop in north-central Iran, "indicated that Tehran enjoys a good level of cooperation with the agency," something that would, in turn, contribute to the "trust-building process" during the negotiations, Guterres said.
The United Nations, he asserted, would deploy all of its available mechanisms to help the negotiations succeed.
Foreign Ministry spokesman Saeed Khatibzadeh, meanwhile, responded to a statement released on Monday by the UK, France, and Germany, in which they faulted Iran's negotiation logic and accused the Islamic Republic of causing the negotiation process to prolong.
"Any statement on JCPOA that fails to mention US culpability only conveys utter ignorance," the spokesman tweeted, referring to the nuclear deal by the acronym of its official name, the Joint Comprehensive Plan of Action.
Any statement on JCPOA that fails to mention US culpability only conveys utter ignorance.— Saeed Khatibzadeh | سعید خطیبزاده (@SKhatibzadeh) December 15, 2021
If E3 wants to be taken seriously as fair partner, it needs to behave like one.
For Iran, JCPOA "hollowed out" when promised dividends failed to materialize. They must be delivered, FINALLY!
"If E3 (the UK, France, and Germany) wants to be taken seriously as fair partner, it needs to behave like one," he added.
"For Iran, JCPOA 'hollowed out' when promised dividends failed to materialize. They must be delivered, FINALLY!"