What to do with the returnees?

[Kralizec]

So, we cannot just ignore the problem, as they are still citizens of the countries of origin. And in France, you can't take the citizenship away.
Difficult difficult.

Apparently, yes you can.

There are some international treaties which restrict this possibility, such as the one regarding stateless persons like Frag said.

The article suggests that it's only possible for people who've acquired French citizenship through naturalization. If true, I guess that makes sense in one way but you could easily argue the opposite. Personally I'm ambivalent about the idea.


EDIT: to answer the original post...and besides "islamic terrorists are EVIL!!!1111!!"....

...volunteering to fight as an insurgent against a recognised government (i.e. Iraq) is a serious crime in most jurisdictions.* If a Dutch person leaves to fight for ISIS and then returns, I personally see no reason why he shouldn't be prosecuted. The excact level of punishment should be left to the judiciary.

For people who have traveled there but haven't actually fought or committed atrocities, I'd be in favour of a soft-hand approach. They most likely would still be nasty fundamentalists and all that, but in the absence of any crimes committed there's isn't much you can do except keeping a close eye on them.

(*apparently not in Russia, but we have another thread for that)