Iran’s nuclear chief said the country is building a new generation of centrifuges for uranium enrichment but that they need further tests before they can be mass produced, apparently trying to counter hard-liner criticism of its nuclear deal with word powers. Under a landmark nuclear deal reached last month in Geneva, Iran promised not to bring new centrifuges into operation for six months, part of temporary limitations on its uranium enrichment program in return for the easing of some sanctions. But the deal does not stop it from developing centrifuges. Salehi’s comments appeared aimed at showing the country is moving ahead with its nuclear program into order to fend off criticism by Iranian hard-liners, who have denounced the deal, calling it a surrender in the face of Western pressure. The government of new President Hassan Rouhani says the deal recognizes Iran’s right to enrich uranium. […]