IAEA reports activity at the Yongbyon reactor, which had been inactive since December 2018; Washington closely coordinating with partner countries, senior US official says

European source says main aim of Massimo Aparo's trip will be to ensure the IAEA can still monitor the centrifuge cascades at Natanz

No decision yet on extending expired agreement that let International Atomic Energy Agency review camera recordings, or on deleting the material, according to foreign ministry

UN nuclear watchdog says it received no reply from Tehran over an extension to the already temporary agreement, which lapsed last week

Iranian envoy to IAEA asserts agreement to keep recordings of nuclear sites 'shouldn't be considered as obligation'; US official says Tehran 'should engage' with the agency

Envoy to International Atomic Energy Agency says that claim is 'counterproductive' and 'deeply disappointing' to Tehran, warns attitude could become an 'obstacle' in negotiations

US secretary of state admits he's unsure Tehran interested in rejoining pact; IAEA chief adds to skepticism, saying 'space narrowing' for a temporary deal

UN nuclear agency head Grossi has been pushing Tehran for answers on three sites dating back many years where inspections revealed traces of uranium of man-made origin

Conservative council paves way for hardliner to win, while determining the supreme leader's stance is key to anticipating the next moves in Vienna

Head of UN nuclear watchdog urges tight monitoring, warns that even if 2015 pact is revived Iranian program cannot be rolled back to previous status