Western and more recently Russian airstrikes, chaotic leadership and mass defections have weakened the jihadi group to such an extent that it would be unable to repel even a small invasion force.
A terror analyst told Express.co.uk that the fanatics have vastly exaggerated their military strength and called on Western leaders to launch a co-ordinated fightback which would obliterate the hate group.
Dr Afzal Ashraf said ISIS has become its own worst enemy with its campaign of terror against the West, which has prompted an international backlash.
A US-led coalition including Britain has launched airstrikes against the extremist group which have killed thousands of its fighters after being outraged by its barbarity.
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