Well surely didn't stop the Feds from arresting the owner of the largest torrent site and extraditing his ass from poland lol,
so I'm sure if the US wanted to they can do just about anything they want, whether it's legal will be left for the appeals court to decide

)
Not true. Poland, as an example, is a NATO ally so there is a mutual interest in not harboring criminals within foreign borders. They also rely heavily on outside intervention should shit truly hit the fan
If our reach was as far as you say, then Snowden wouldn't still be writing anonymous apps (Bring the dude back and pardon him already, damn, he does good work. We want people like Snowden on OUR side)