"A committee is studying the fourth step," Vaezi told reporters in Tehran today.

He added that Iran "will take the fourth step in due time" if what the country seeks does not happen during talks and meetings before the two-month deadline after the third step.

In relevant remarks earlier in October, Spokesman of the Atomic Energy Organization of Iran (AEOI) Behrouz Kamalvandi announced that only two other steps had remained for his country to end the nuclear deal undertakings if the Europeans still continue insistence on not meeting Tehran's demands.

“Only two more steps will end all of Iran’s JCPOA undertakings and will return the country to the pre-JCPOA conditions,” Kamalvandi said in an interview with the state TV.

“As soon as the Fordow nuclear site comes into operation for uranium enrichment and the number of centrifuge machines rises, Iran will practically have no more commitments to the JCPOA and only the monitoring issues will remain,” he noted.

Kamalvandi added that Iran's stockpile of enriched uranium and the number of centrifuge machines are growing and the Europeans and the US are concerned about reduction of the Islamic Republic's JCPOA commitments.

“Thanks to the pressure of world major powers, we are able to easily manufacture the best centrifuges,” he said, adding that Iran would have faced many problems, including in the pharmaceutical industry, without progress in the nuclear industry over the past decades.

Iranian Foreign Ministry Spokesman Seyed Abbas Mousavi also said earlier this month that his country had devised plans and was getting ready for undertaking its next step of scaling down commitments under the nuclear deal of 2015, officially known as the JCPOA.

"Iran has prepared the required plans for the fourth step of scaling back its JCPOA commitments," Mousavi said, adding that the 4th step is most likely to be undertaken as the European signatories of the agreement are unable to deliver on their promises without a prior permission issued by the US President Donald Trump.

“Europeans have not been successful to meet their JCPOA commitments and have tied all of their decisions and measure to Trump’s confirmation,” he said, adding, “Iran has its own plan and its own predictions and if the Europeans remain impotent, Iran will take the fourth step.”

Tehran has rowed back on its nuclear commitments three times in compliance with articles 26 and 36 of the 2015 deal.

Iran says its reciprocal measures will be reversible as soon as Europe finds practical ways to shield the Iranian economy from unilateral US sanctions which were imposed last year when President Donald Trump withdrew from the 2015 nuclear deal.