On Day 3 of the crisis following Ayatollah Khamenei's killing, the conflict has exploded across West Asia. Iran claims strikes on Israeli leadership and retaliatory hits on 14 countries, while the US admits combat deaths and insists the war is "going to plan." With American F-15s downed in Kuwait and Gulf nations suffering major attacks, on The Buck Stops Here we asks: Is the world edging toward its biggest war yet?