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Given the complexity of any potential conflict and the lack of viable alternatives in Iraq and Syria, it may be better to contain the threat of the Islamic State (IS) rather than attempt to destroy it.

Dr Denis Dragovic told Sky News' Reporting Live program that there was no obvious alternative to IS - President Assad is a dictator who has killed his own people, the Free Syrian Army is not a viable alternative. 

Dr Dragovic said it may be necessary for Western countries to deal with the Assad regime through backchannels, however unpalatable that may be.