Over the past month, ISIL has claimed responsibility for bringing down a Russian airliner over Egypt's Sinai Peninsula, suicide blasts in Beirut, and attacks in Paris.

Both Russia and France have responded by intensifying air strikes against ISIL targets in Syria. Across the West, heightened concerns have prompted officials to bolster security measures, with ISIL vowing to strike again. 

So, what is behind the group's recent string of attacks? Is ISIL changing its strategy to bring about a confrontation with the West or is it trying to deter further military attacks on its so-called caliphate?

In this week's Headliner, Mehdi Hasan asks Richard Barrett, the former head of counterterrorism at MI6, about ISIL's motivation.

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Source: Al Jazeera