US-Israel-Iran: How Far Can the War Go? How Will it End?

With the US-Israel-Iran war becoming a regional crisis how much worse could the situation become? Can decapitation really lead to regime change in Iran? How long can Iran fight on? Will UAE, Qatar, Bahrain and Saudi Arabia retaliate? And what more does President Trump have in mind? Those are the key issues Karan Thapar discusses with the Defence Editor of The Economist, Shashank Joshi.