Iran celebrated the removal of economic sanctions on Sunday, even as regional rivals warned that it was still out to destabilize the Middle East and needed to be closely monitored. Western officials said the implementation of Iran’s nuclear deal with six world powers, which allowed for the lifting of some economic sanctions, raised prospects for overhauls within Iran’s political system. The deal has been a priority for President Hassan Rouhani, a relative moderate in the conservative clerical regime who was elected on a platform of engagement with the world in 2013. Mr. Rouhani hailed the implementation of the deal, saying this had turned a “golden page” in the country’s history and heralded an economic revival. “Conditions will be better than before for political and economic relations with regional countries, and we can resolve regional problems,” Mr. Rouhani said in a televised news conference, pointing to hope that the deal […]