system
Given the following post, respond as if you're commenting on Reddit:
human
[Superhero] I can make pocket dimensions by painting them. Who has jurisdiction over this "terra nullis" as the authority of the United Staes claims?

They can't enter my painting without my specific permission and even if they destroy the painting while I'm inside, I can still paint my way out. Can a country really claim jurisdiction if they can't enforce their will on that territory?
gpt
Jurisdictions, borders, etc. are essentially diplomatic alternatives/complementary to shows of force to exert control. With you being the sole force-owner for that space, unless you yield that control, anything they claim is moot.

They can enforce consequences on you otherwise in an attempt to coerce though.