"I stress that we will continue to reduce our commitments until Iran’s demands are met," Araghchi said on Sunday.
He added that the meeting of the joint commission in Vienna was "constructive."
Earlier in the day, the extraordinary meeting of the Joint Commission, where the representatives of the United Kingdom, France, Germany, Russia, China and Iran discussed ways to save the deal, took place in the Austrian capital of Vienna.
The situation around the accord, which was sealed back in 2015 and considered one of the landmark achievements, escalated in May 2018 when US President Donald Trump withdrew from the deal. Washington proclaimed back then it intends to bring down Iran’s sale of oil to zero and re-introduced sanctions on almost all major sectors of the Iranian economy.
A year later, Iran announced that it had partially discontinued its commitments under the deal and gave Europe 60 days to ensure Iran's interests were protected under the agreement. When the deadline expired on July 7, Tehran said that it was prepared to begin enriching uranium beyond the limit of 3.67 percent set out in the deal.