In the european union, all countries are linked, so if you dont pay you will have problems.
The onlz country that does not have an agreement in europe is France and Switzerland. So in France I get flashed all the time and they cant bill, since they dont even have access to the computer to look up, who owns the plate. All other countries wills send me a bill home and then if I dont pay, I can have problems if I visit the EU, so not worth it.
No, they dont keep the fines in Israel, if they see its a chuznik, it gets burned, so you have nothing to worry about. Unfortunatly Israel has bigger problems to worry, then catching a chuznik, that owes 100 shekels