btw nobody sane is believing that US wouldn't force to land plane flying over US with Snowden in it - but Snowden isn't that stupid I guess.
Sovereignty is likewise about might and not right. They are sovereign because they can do things like this. Anyone who can reliably do things like this in given area is sovereign, but that doesn't mean that anyone has the right to do things like this. Might does not make right.
The Snowden story is plausible - but it's still hypothetical. And of course the same international community (of US allies) that would resist extraditing Snowden today, would protest if the US forced a plane between two other countries and full of their citizens to land in the US.
All that aside: the focus shouldn't be taken away from the fact that the real crime is arresting an opposition journalist/activist.