I actually meant shoot him and hopefully Pakistan continues to pretend he's not theirs. That might send the right signal.
Discussion
I like the Age of Sail pirate custom of marooning for cases like this. Drop him off on a wave-swept rock with a loaded pistol and a bottle of his intoxicant of choice.
Because technology has advanced (and unclaimed rocks are scarce), we could use the stratosphere instead of a rock.
Waste of a good pistol if you ask me.
Well, yeah. There is that. But I think the pistol goes not for the sake of the man marooned but for the consciences of those who leave him there or so that no-one else has to tarnish their conscience killing him....
I honestly doubt they'd disapprove at all. It's the Germans who'd cry about it.