“Only a more federal Europe can cope with these challenges, ensuring the respect of our fundamental values and rights.(…) To this end, we support the creation of a renewed cross-partisan and inter-institutional pro-European coalition encompassing the most committed Member States in the European Council, the pro-European majority in the European and National Parliaments, the European Commission, and regional and local institutions, over and above the particular inertias of each institution, and the pro-European organized civil society. We call on them all to mobilize locally, nationally, and transnationally to support these requests for a more sovereign and democratic Union.”
This text is based on the declaration adopted by the relaunched Action Committee for the United States of Europe, 18 October 2025, Jean Monnet House, Houjarray/ Bazoches-sur-Guyonne, France
Of course there are solutions The principle of subsidiarity is one. Doing projects between states like you said are another for example. Problem is always that people be people, and they like power and money. And also there is little any "piece of paper" can do against dictators with guns. No piece of law will probably ever change that, I’m afraid.
Which is why centralizing power is generally a bad idea, making a federation a bad idea.