Iran's Revolutionary Guard Corps declared the Strait of Hormuz closed on Saturday, warning ships not to approach the critical waterway [1, 3].
This move threatens one of the world's most vital oil transit chokepoints and signals a sharp escalation in tensions between Tehran and the West. The closure occurs amid fragile diplomatic efforts to maintain nuclear stability in the region.
The announcement came at approximately 4:59 p.m. local time on Saturday [1]. The Revolutionary Guard said the closure was a response to alleged breaches of the 2023 U.S.–Iran Memorandum of Understanding on nuclear negotiations by the U.S. and Israel [2, 3].
"This is the first step in retaliation against violations of the US‑Iran Memorandum of Understanding," said IRGC spokesperson Mehr [2].
The Strait of Hormuz is the narrow passage between Oman and Iran that connects the Persian Gulf with the Gulf of Oman [1, 3]. The Iranian military said that ships are warned not to approach the waterway [1].
U.S. officials have disputed the reality of the closure. U.S. Vice President JD Vance (R-OH) said the straits really are open [3].
This is not the first time the IRGC has threatened or reported a closure of the passage [3]. The current move raises significant doubts about the viability of ongoing talks regarding the 2023 memorandum [3].
“"This is the first step in retaliation against violations of the US‑Iran Memorandum of Understanding."”
The contradiction between the IRGC's announcement and the U.S. government's assessment suggests a psychological warfare tactic intended to pressure negotiators. By threatening the Strait of Hormuz, Iran leverages its geographic control over global energy arteries to signal that any perceived breach of the 2023 nuclear memorandum will have immediate economic consequences for the international community.
