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Nuclear program of Iran (https://en.wikipedia.org/wiki/Nuclear_program_of_Iran)

"The nuclear program of Iran has included several research sites, two uranium mines, a research reactor, and uranium processing facilities that include three known uranium enrichment plants.[1] In 1970, Iran ratified the Non-Proliferation Treaty (NPT),[2] making its nuclear program subject to the IAEA's verification. ... In the 2000s, the revelation of Iran's clandestine uranium enrichment program raised concerns that it might be intended for non-peaceful uses. The IAEA launched an investigation in 2003 after an Iranian dissident group revealed undeclared nuclear activities carried out by Iran.[5][6] In 2006, because of Iran's noncompliance with its NPT obligations, the United Nations Security Council demanded that Iran suspend its enrichment programs. ... However, in July 2019 the IAEA stated that Iran had breached the agreement.[19] Iran has, since its breach in July 2019 of the JCPOA,[20] embroiled itself in controversy with half of the JCPOA signatories because a November 2020 IAEA report said that Iran had further developed centrifuge technology, the novelty of which was explicitly prohibited by the JCPOA.[21] The IAEA report also said that Tehran "holds more than 12 times the amount of enriched uranium permitted under the JCPOA, and that "work has also begun on the construction of new underground facilities close to Natanz, its main enrichment facility".[22]"