Iran gave no ground on the core issues of nuclear restraint and transparency in its protracted standoff with world powers, concerns they will pursue in another round of talks this month.
Tehran insisted on its right to a sovereign nuclear energy programme despite U.N. resolutions ordering it to suspend enrichment in exchange for trade benefits. It has even rejected a temporary freeze on expansion of enrichment capacity.
No progress was reported on IAEA demands that Iran allow unfettered access for its UN inspectors to check intelligence reports suggesting suggesting Tehran has researched ways to arm missiles with nuclear payloads.