What I don't understand is the the following. 1. Julian is not a United States of America Citizen. So USA laws don't apply to him, unless he is in the USA and has committed a crime or offense of some kind 2. Julian is a citizen of another country. How do the laws of USA all of a sudden encompass people outside of the USA? Yes, wikileaks did receive "secret" stuff, but the exposure of these events is for the greater g…
If an estranged noncitizen parent living abroad conspires to kidnap his children from their custodial parent inside the US, he can be tried for kidnapping by the US. Even if his part of the conspiracy never takes place inside the US. The alternative- just letting him off, due to where he happened to physically be at the time- would be fairly absurd. The jurisdiction he's physically in probably doesn't care, and even if they do, most of the witnesses and all of the victims are physically in the US.
The US can't kidnap him but asking the jurisdiction he is in to extradite him is totally normal. This is what extradition agreements are for, in part.