tl;drFrench courts kind of are subservient to the CJEU, and EU states are not entirely sovereign. Specifically, certain kinds of rulings (particularly those th

tl;drFrench courts kind of are subservient to the CJEU, and EU states are not entirely sovereign. Specifically, certain kinds of rulings (particularly those that prevent a state from doing something) have what's called "direct effect" - they do not require state legislative or administrative action to take effect. States have signed away sovereignty in a very real sense.