Tehran’s Middle East strategy after a lethal attack on US troops. The risk of military escalation in an already volatile region is growing. President Biden has promised to respond after what he called “Iran-backed militants” killed three American soldiers and injured dozens at a base in Jordan. Iran denies it. But its proxies are active across a number of fronts, from Gaza to Lebanon, Yemen to Syria. For insight into how these pieces fit together, Katya speaks with the BBC’s chief international correspondent, Lyse Doucet, and BBC Persian’s senior reporter, Parham Ghobadi.