> I cant imagine nation have enough power that can keep these thing for years just for historical standpoint

.su is one such domain. The Soviet Union of course no longer exists, but .su continues on. ICANN has told Russia they want to phase it out by 2030 (after Russia more or less refused to shut it down in the 90s), but who knows if that will happen.

.su even still accepts new domain registrations!

I think you can predict the average kind of people who wants a .su domain, though...