Countries Closest to Tuvalu

Really? Have you been to any of these places? If you had been you'd know that that is nonsense. In the broadest sense they are, inasmuch as they are all a part of the Realm of New Zealand, but they are separate countries in every other sense of the word, including right now during the Covid-19 pandemic where New Zealanders cannot travel to either the Cooks or Niue, and the mandatory 14-day quarantine when entering NZ which applies currently to every country. When the borders re-open, you still don't fly there from the domestic terminal, but from the international terminal where you have to clear customs at both ends. NZers get their passports stamped with a 30-day maximum entry permit, employment prohibited.