That's rendition which Sweden has recently resisted wrt the US. Extradition is merely treaties and regulation, not strictly law. And it's full of nuances - e.g. exceptions for political crimes which is probably highly relevant in this case. I see no reason why a team of lawyers paid the same amount of cash reference in the article wouldn't be able to sort this out to the mutual satisfaction of the two (three if you include the UK) parties involved.