It will be interesting to see if the US tries to extradite him. It's actually not 100% clear that he's broken any US laws in any ways that they aren't also routinely broken by newspapers. There's a few avenues: 1) Publishing classified information. Easy to show that he did this but a very difficult path to go down when American newspapers do this all the time. 2) Conspiracy to commit espionage. Probably the most like…
A difficult path, maybe, but also an avenue for setting precedent to go after the press.