The head of the U.N. nuclear watchdog visited two Iranian nuclear sites on Friday as part of a visit to Iran, ahead of an expected European diplomatic push over Tehran's atomic activities before Donald Trump's return to the White House.

The UN nuclear chief toured two Iranian uranium enrichment plants that have been the focus of Western concern on Friday after Tehran said it was ready to address "doubts" about its ambitions.

Director General of the International Atomic Energy Agency () Rafael Grossi on Friday visited two Iranian nuclear sites of Natanz and Fordow for the first time. During his visit, Grossi was accompanied by Massimo Aparo,