In a letter to the UN, Araghchi said: “Iran strongly warns against any adventurism by the Zionist regime of Israel and will decisively respond to any threat or unlawful act by this regime.” He said Iran would view Washington as a “participant” in any such attack, and Tehran would have to adopt “special measures” to protect its nuclear sites and material from any attacks or sabotage. Araghchi said the UN nuclear inspectorate, the IAEA, would only be subsequently informed of such steps. An adviser to Iran’s supreme leader said in April that Tehran could suspend cooperation with the UN nuclear inspectors or transfer enriched material to safe and undisclosed locations. In a separate statement released on Thursday, Iran’s Revolutionary Guards said Israel would receive a “devastating and decisive response” if it attacked Iran.