It is not true, source: I work for an institution that would be impacted by such a ruling. There are requirements for sovereignty, but as usual people play fast and loose with the concept. Governments are not more competent than anyone else.
The statement is so vague it can't be true anyway. What's Europe? The continent, the EU or one of the organisations that EU membership often come with?
I actually know what I'm talking about. You're free to disagree and "just ask questions", but I don't want to engage with tedium.
I was agreeing with you. I found the statement that 'the political systems of Europe' so vague it couldn't be true. It's why I listed several different definitions of Europe.