Talks between world powers, Iran and the United States are due to resume in Vienna on Thursday, but in a joint statement Britain, France and Germany said Tehran's decision to enrich at 60 percent was not based on credible civilian reasons and constituted an important step in the production of a nuclear weapon.
"Iran's announcements are particularly regrettable given they come at a time when all JCPoA (Joint Comprehensive Plan of Action) participants and the United States have started substantive discussions, with the objective of finding a rapid diplomatic solution to revitalize and restore the JCPoA," the three countries said.
"Iran’s dangerous recent communication is contrary to the constructive spirit and good faith of these discussions."
Tehran has said its decisions came after arch-foe Israel sabotaged its key Natanz nuclear site on Sunday."In light of recent developments, we reject all escalatory measures by any actor, and we call upon Iran not to further complicate the diplomatic process," the E3 said.