I mentioned "a computer" to highlight the fact that the person was never physically in "country C", but you're right that in this specific case the jurisdiction

I mentioned "a computer" to highlight the fact that the person was never physically in "country C", but you're right that in this specific case the jurisdictional questions are made more complicated by the (alleged) involvement of an accomplice who was physically present in country C. I suppose, from the prosecution's perspective, the involvement of an accomplice may make the jurisdictional questions more simple, but I still think that if a computer has been accessed illegally and classified government documents have been leaked by a citizen, all with the help of a non-citizen, then at least some people would find it bizarre if the non-citizen wasn't considered legally culpable.