Iran's new supreme leader vows to keep blocking Strait of Hormuz in his first statement released by the regime after more attacks on cargo ships in the Gulf in the US-Israeli conflict with Iran, causing another spike in oil prices.Can American naval power keep those shipping lanes open? We'll assess the options and hear what people in America's heartland think about the war.Also in the programme: Will a new "ethnic unity" law in China lead to more disunity?; and a piece of rock music history goes up for a sale - a rather battered guitar that belonged to Nirvana's Kurt Cobain.(Photo shows the Thai-flagged cargo ship Mayuree Naree on fire after being hit by Iranian missiles in the Strait of Hormuz, Iran, on 11 March 2026. Credit: Royal Thai Navy)