Under the deal between Iran and world powers, Tehran agreed to curtail its nuclear program in return for sanctions relief.
"The peaceful nuclear activities of the Islamic Republic of Iran are fully within the framework of global laws and completely legal and legitimate, and in line with countries' intrinsic legal rights", Khatibzadeh said.
Israeli Prime Minister Benjamin Netanyahu, in an apparent message to U.S. President-elect Joe Biden, said on Sunday there should be no return to the 2015 Iran nuclear deal abandoned by President Donald Trump. It added that Iran has been continuing to enrich uranium to a purity of up to 4.5%, higher than the 3.67% allowed under the deal.
After remaining committed to the nuclear deal for one year under new United States sanctions, Iran started gradually scaling back its commitments in moves it said are quickly reversible.
The United Nations' International Atomic Energy Agency (IAEA) said on Wednesday that Iran has again breached its nuclear deal with major powers by firing up advanced uranium-enriching centrifuges installed underground at its main site, Natanz.
The IAEA found that Iran had been feeding uranium hexafluoride (UF6) gas feedstock into advanced IR-2m machines, whose installation had been noted in the IAEA's last report on 2 November.
Iranian Foreign Minister Mohammad Javad Zarif has said Tehran will immediately observe the terms of the deal if Biden fulfills U.S. commitments, such as lifting sanctions. "This is completely in line with the JCPOA and Iran has always stressed that if other parties fully implement the JCPOA, Iran's nuclear steps are reversible", he said.