Washington told the Strait of Hormuz it belongs to the United States and started blocking Iranian oil there under Operation Economic Fury, a naval campaign the Trump administration launched this month to strangle Tehran's exports. The claim is not a lawyer's error. Hormuz has never been sovereign to any single state; the assertion is a signal about what Washington believes it may do in a chokepoint it does not own, backed by ships already on station and a blockade already running.

Taipei is the reader who has to price this. The Taiwan Strait is the other chokepoint where Washington's actual commitment has always lived in the gap between what a treaty says and what a president will spend ships to defend, a gap this desk has been tracking since the trigger clause obscured by design (2026-08-01). Hormuz shows the mechanism when Washington chooses to fill that gap: not a statement of law, a deployment. What Taipei's planners now have to weigh is whether Beijing reads the Hormuz claim as proof Washington will act unilaterally near a strait, or as proof it will only act where the ships are already sailing. The next test is what Washington calls the blockade in six months. If it survives, the vocabulary of ownership becomes reusable.