So far they seem unstoppable in their advances in the Middle East and the West seems unwilling to intervene (beyond a few symbolic air strikes and arming Kurdish militias). They have expressed their desire to conquer Europe and enforce their version of Sharia on numerous occasions. They have many active supporters in the continent already, some of which have received military training in Syria.
Their intentions are clear, but will they go through with them? Will they succeed? Who will stop them?
Let's hear your thoughts on this.