Six months on, the strategy to defeat Islamic State militants remains a work in progress, run by a coalition that's also a work in progress. As delegates from 60 nations meet in Brussels to map out a plan, there are reports of Iranian jets bombing IS group positions in Iraq. The Pentagon insists there's no coordination between Tehran and Washington. True or false? And does the de facto common cause between Shiite Iran and Sunni Gulf States unite the Muslim world or undermine its leaders?

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