Iran supreme leader Ayatollah Ali Khamenei hailed on Sunday the "achievement" of the country's negotiating team in clinching a long-elusive nuclear deal with world powers, Fars news agency reported. "The nuclear negotiating team should be thanked and appreciated for this achievement. God's grace and the support of the Iranian nation were the reasons behind this success," Fars quoted Khamenei as saying. "Resistance against excessive demands should be the criteria for (nuclear) officials," he added.