Still at a high level and theoretical rather than immediately practicable, but this article lays out the ISIS/Europe dilemma better than anything I've read.
http://www.theatlantic.com/international/archive/2015/11/europe-muslims-paris-terrorism/416964/
http://www.theatlantic.com/international/archive/2015/11/europe-muslims-paris-terrorism/416964/
