Explainer-Why are the Houthis threatening to attack Red Sea shipping and what does it mean for oil markets?

Yemen's Iran-aligned Houthis announced a ban on ships linked to Israel from the Red Sea following renewed Israeli military attacks on Iran. This action heightens concerns about global shipping and energy flows, particularly after Iran's closure of the Strait of Hormuz since February 28 disrupted Gulf oil exports, causing price spikes and a major energy shock.