Hmm... Well... Good guess! But perhaps:
North Sentinel Island might like a word with you...
Representin' 60,000 BC b()tches!
But hey, if you want to counter-argue with me, then fair enough, but the thing is:
NOBODY can check for certain, because...
Guess what:
They FULLY and ABSOLUTELY to this day aggressively control access to their island! So to this day, after 60,000 years, nobody can say exactly what the f'ck is really going on inside that island!
So that sounds intriguing right? And so... you maybe want to go visit them?
Whelp... Ya: good luck with that buddy!
You might insist upon getting close to them, wanting to offer a nice friendly civilized tea and cookies session with them...
But instead: they simply take you out with multiple amazing hits from long range high energy fired arrows! (Seriously these people's warriors are world leading snipers, if anything else!)
But hey... let's say you want to get really really stupid, and then you have blind dumb luck, and actually manage to sneak onto their island territory shore itself...
And maybe you insist upon approaching them as they finally notice you, while you are holding up a bible, and proclaiming that you've come in the name of the Lord, Jesus Christ, to offer them the word of wisdom (as some religious nut job actually tried to do a few years ago)...
Then... ya... That ain't ending well for you, no sir!
Again: good luck with that!
Because those few that actually make it to the shore sneakily enough (some of them using night-vision goggles in their attempt), still end up fully captured, and then systematically tortured and dragged screaming and bleeding across the beach the next morning, repeatedly in plain view of the nearby boats... as direct example...
And then executed right in front of the observing boats.
All of which means:
No matter who you want to say owns that island (for now, the world agrees it is India)...
Ya... nice try, but I'm sorry: The North Sentinel Islanders are FULLY and absolutely in possession and in charge of that island, and nobody knows what the F is going on with those humans, on that island.
(In other words, let's just say: Indian law has never attempted to execute a search warrant to that island! Again: not even India itself knows anything about the comings and going of the interior of that island.)
THUS... in the end:
The North Sentinel Islanders are truely FULLY in control and occupy their own island, and all viable and realistic access to it, and the daily governance of that island.
As they've done for 60,000 years.
That makes them a full nation-country-state in my books!