And if the countries refuse to pay what happens?
It wouldn’t surprise me if they hand the first fine to Hungry, who then dispatches forty truck-loads of gravel and dumps it at the EU headquarters as payment number one (payment in rocks rather than cash). Poland will be second, but load up dozen trucks with watermelons and dump them on top of the EU grounds.
Yes, what army is Brussels going to use to enforce payment if EU member states refuse to pay?