War on terror - How to combat IS?br br French President Francois Hollande is on a diplomatic mission: to the UK, US and Russia—seeking allies in a war against Islamic State. How can IS be defeated?br br Join the conversation: quadriga(at)dw.combr br Guests:br br -Ulrike Herrmann is an author and a journalist with the Berlin-based daily the Tageszeitung, or TAZ. br br -Alan Posener is a commentator for the daily newspaper “Die Welt”.br br -Daniel Gerlach is the founder and editor of “Zenith”, a German magazine focusing on politics, economics and culture in the Middle East.