Vance arrives in Switzerland for talks with Iranian negotiators amid rising Strait of Hormuz tensions

Iran's military claims it has closed the Strait of Hormuz amid ongoing Israeli strikes in Lebanon, while the U.S. disputes the closure — VP Vance is now in Switzerland for direct talks with Iranian negotiators. If the closure holds or escalates, roughly 20% of global oil supply transits through the strait, creating an immediate supply-shock risk that ripples across energy, shipping, and risk assets broadly.
A physically enforced Hormuz closure removing even a fraction of the strait's ~20 million bpd flow would be the largest supply disruption since the Gulf War, historically driving Brent up 10-20% within days and lifting the entire energy complex.
Iran's Hormuz closure announcement could be a negotiating posture rather than a genuine blockade — the U.S. Navy's Fifth Fleet is homeported in Bahrain and has historically kept the strait open, and Vance's diplomatic presence in Switzerland signals both sides are actively seeking an off-ramp that would rapidly deflate the risk premium.


