Countries the world over have their territorial waters. That is nothing new.

Certainly they do. And there are few disputes because most of them have been in place for many decades or even centuries. The two sides have reached an accommodation that - more or less - works.

Before we joined the the EU (and its predecessor) we had such an accommodation with France and the other countries that fished in the Channel and North Sea. It was not just a case of "its the UK's and no-one else gets a look in."