According to a report, in the 2015 nuclear deal Iran agreed to limit sensitive nuclear activities and allow in international inspectors in return for the lifting of thought to be extensive sanctions. The plan limited Iran’s centrifuges enriching uranium until 2026. Reportedly the u.s. who were buying uranium from Iran pulled out of the deal in 2018 and reimposed sanctions. Iran are said to have not stuck to the agreement since, thought to be due to the resuming of sanctions. They were said to have since been selling uranium to Russia.
The 2015 arms embargo allows the u.n. security council to monitor all conventional weapons bound for Iran, which according to the agreement have to be approved in advance. Permission is also required with regard to the selling of nuclear components, said to be based on end user guarantees. The eight year plan is due to terminate in 2023.