Worn,
If a state is not bound by contract to protect someone, as in the case of foreign citizens or its own, a person is in a state of nature. The state can therefore do whatever it pleases with them. That doesn't mean the state has particular reason to hunt them down, but it will if the state's own citizens are targeted or become collateral damage.
I'm speaking philosophically, of course. The UN has made decisions regarding stateless people, but it doesn't concern me because, as you know, I don't consider the UN a legitimate authority.