ISIS on the offensive in Iraq

[Viking]

You mean like how you support the Taliban in order to weaken the Soviets?

No, like bombing Vietnam in order to weaken China.

Don't see how making the only solution to IS stronger is a bad idea.

It might just make IS stronger instead. Let's see who's better at filling any vacuum - IS or the dictator.

Of course, IS expanding at the cost of other rebel groups would fit Russia's narrative: that Assad is a misunderstood youth who should be showered with love.