Earlier quoted context omitted.
If he's outside the US and the country he is in had an extradition treaty with the US, but has no comparable law in the books, wouldn't that impede extradition?
That didn't stop Montenegro from finding some other probable causes (fake passports) to arrest Do Kwon. They are now trying to decide where to extradite him. US, South Korea and Singapore all want a piece of him. https://www.rferl.org/a/montenegro-korea-kwon-terraform/3234...
Forging passports is a serious crime.