This will end in one of two ways
1) He spends the next 300+ years locked up in so fed rathole
2) He spends the rest of his life helping the Feds write super unbreakable Wannacry/Kronos stuff.
The Feds will throw the book at him at the start and then his legal team (more likely a wet behind the ears public defender) will do a deal to get to 2).
There is a moral to this but it contains so many sweary words that I'd get banned for posting it.
Quite why he went to the USA in the first place is beyond me.