As for free trade, it effectively says that you can export to my country if your country do not restrict export to my country. Yes it destroy a country’s sovereignty. Actually it destroys the government’s sovereignty and improve businessmen’s power.
Yes that needs to be on paper. Globalization happens because countries make deals like that.
I think we need to separate commercialize free and political free. In commercialize free, yea we’re like libertarian. You’re free to do anything you want as long as it’s consensual. It’s not natural. Why should you stop at others’ consent? What is your best interest to just stop at others’ consent.