The International Atomic Energy Agency declared Iran was in breach of its Nuclear Non-Proliferation Treaty obligations by failing cooperate with an probe into undeclared nuclear material and activities at multiple sites.

U.N. atomic agency chief Rafael Grossi condemned the Israeli attack on Iranian nuclear facilities, warning they posed significant safety risks and violated the U.N. charter and international law. “This development is deeply concerning.

Officials at Tehran are threatening diplomatic and military countermeasures to an American-backed resolution at the Vienna-based nuclear watchdog to censure Iran, which could eventually revive painful global sanctions on the Islamic Republic.