Iran's IRGC says the Strait of Hormuz is closed, and any transit and movement will be possible only with the coordination of the IRGC Navy

Declared closures of the Strait of Hormuz sit in a familiar category: Iranian forces have periodically threatened or signalled restriction of the chokepoint during periods of escalation, and full sustained closure has historically not materialised, with episodes of this kind tending to resolve into harassment, seizures, or transit under escort rather than interdiction. The operative distinction is between rhetorical closure and physical enforcement: the channel that matters is whether tankers actually stop transiting, which shows up first in freight rates, war-risk insurance premia, and ship-tracking data before it shows in prompt crude. Roughly a fifth of global oil supply and a large share of LNG trade passes through the strait, which is why even unenforced declarations tend to put a risk premium into the front of the crude curve and widen the prompt backwardation. Past episodes have followed a sequence of declaration, insurer repricing, naval escort arrangements, and then gradual normalisation unless kinetic incidents follow. The tells worth watching are tanker traffic counts, any seizure or strike on shipping, and whether Gulf producers begin diverting through bypass pipelines, which cap only part of the flow. Statements from the IRGC specifically, rather than the civilian government, have historically signalled posture rather than settled policy, so confirmation from the state side is the next filter.