The head of the UN’s atomic watchdog said Thursday that Iran continued to abide by the nuclear deal reached in 2015 with major world powers that aimed at preventing Tehran from building atomic weapons in exchange for economic incentives. Speaking at a board meeting Thursday in Vienna of the International Atomic Energy Agency, Director General Yukiya Amano reiterated the agency’s findings in a report distributed to member states earlier this month that “Iran is implementing its nuclear-related commitments under the Joint Comprehensive Plan of Action.” The issue has grown more complicated since the US withdrew unilaterally in May from the...