Maybe I'm just completely ignorant of law, but how/why can he be extradited to a foreign country in this manner? Did he previously reside in and operate out of the US?
Y’know those spam calls you get? Where they try to say they are the government? The reason they get away with that is that your country doesn’t have an extradition agreement with their country.
That’s a drastic oversimplification but it’s still true
You know countries with extradition agreements can request extraditions in the other direction, as well?
If an american does a crime in Australia, but makes it back to the states, Australias government can also go "yeah so uuuh that guy killed a dude over here, gonna need him back for trial".
It's what makes it less likely people will just do crime all over other countries and then return home to escape punishment.