Can world powers make common cause against Isis?

France has been courting US and Russian support for a war on Isis in the wake of the Paris terror attacks. But while Russia and Turkey, a Nato member, claim to be fighting the same foe, they themselves saw armed combat this week when Turkey shot down a Russian jet on its border with Syria. Mark Vandevelde asks Gideon Rachman and Geoff Dyer whether world powers are capable of making common cause against Isis.

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