It's probably the last word of that headline where you're questioning what the hell's going on, so here's a little background: "Sentinelese" is simply an exonym for the inhabitants of North Sentinel Island of the Andaman and Nicobar Islands territory in the eastern Indian Ocean, which is kind of like Skull Island from King Kong, (probably) minus the 50 ft tall ape and the dinosaurs he punches.
Nobody knows what the Sentinelese call themselves. Nobody knows anything about them, how many there are – though some estimates number them at a few hundred – or literally anything about their language or culture other than what can be observed from boats a safe distance from the island, which is about the size of Manhattan. They tend to moon boaters if they're not shooting arrows or throwing spears at them. The Indian government has outlawed any contact with the Sentinelese as to avoid introducing any diseases for which they don't have any immunity to.
And they killed the last guy who tried to talk to them, 26 year-old American self-anointed missionary John Allen Chau, in 2019. It's not clear if it can be considered martyrdom if they didn't actually know he was trying to convert them to Christianity. Cops decided against trying to recover Chau's body.
Yet 24 year-old Arizona man Mykhailo Viktorovych Polyakov made it to the island and lived to be arrested for it, the BBC reports, mostly because they didn't see him land on the shore and leave a can of Coke and a coconut for them as he filmed it for his social media following this week. It's not clear how he was caught, what charges or how much prison time Polyakov will face yet, but he's in the clink for at least the next three days as cops continue to interrogate the jackass for his intrusion.
It's not clear what percent tariff the Trump Administration imposed on North Sentinel Island.