Iran, big powers clinch landmark nuclear deal: Iranian diplomats

By Parisa Hafezi, Louis Charbonneau, John Irish and Arshad Mohammed VIENNA (Reuters) - Iran and six major world powers have reached a nuclear deal after more than a decade of on-off negotiation, granting Tehran sanctions relief in exchange for curbs on its nuclear program, Iranian diplomats said on Tuesday. The agreement aims to limit Iran's nuclear work for more than a decade in exchange for the gradual suspension of sanctions that have slashed Iran's oil exports and crippled its econ