Posted on September 5, 2019
President Hassan Rouhani said that from Friday the country would begin developing centrifuges to speed up the enrichment of uranium.
Last year, the US withdrew from the 2015 deal and reimposed punishing sanctions against Iran.
Iran responded by abandoning two other key nuclear commitments in July.
It breached the 300kg (660lb) limit on its stockpile of low-enriched uranium and exceeded the 3.67% cap on the purity of its uranium stocks.
Under the 2015 deal, Iran was not going to operate more than 5,060 centrifuges – the piece of equipment used in making nuclear power and bombs.
Low-enriched uranium, which has a 3-5% concentration, can be used to produce fuel for nuclear power plants. Weapons-grade uranium is 90% enriched or more.
Iran insists it has never sought to develop a nuclear weapon but instead wants to generate electricity.