Enough is enough. Paris, Sharm El-Sheikh, Istanbul, Jakarta. Isis is the global crucible of terrorism and must be stopped using all means available. After the Paris attacks last November, the US and its allies stepped up the bombing of Isis targets in Syria. Unquestionably, the campaign has had some effect and Isis is not the unstoppable force it seemed to be a year ago. Ramadi was taken by Iraqi forces a few weeks ago, and reports are filtering through of disillusionment and desertion amongst the caliphate’s fighters in Syria. That’s why some experts, such as General John Allen, Obama’s former special envoy to Syria, are calling for the West to finish off the job by deploying its own troops on the ground. After all, no one seriously believes that the war against Isis can be won from the air alone or by using existing local forces. But a judicious and limited use of Western ground forces could crush Isis in its vital nerve centres, after which local troops trained up by the West would take over security...

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