Of course it can.
The occupying army is already in place, foolishly invited in by the very countries they plan to conquer.
I think Erdogan made a big mistake by making a fool of her when she was playing along so nicely all these years.
And by the way, as regards Germany, France, and for that matter, Sweden, the weakness of "no-go" areas is that you can isolate them, seal them up, and if need be, blow them to the moon.
1 day for France? They will surrender within the first hour!