https://www.pogo.org/analysis/2016/09/busting-myth-of-whistl...
The espionage act under which he'd be charged doesn't allow a public good defense to be used in court.
https://www.justiceinitiative.org/voices/why-snowden-won-t-g...
What you're asking for structurally can't happen in the US legal system.
So no - he didn't "flee to an adversary", as much as he was "forced to stay at advesary's".
PS: US "justice" system would have granted him no justice. So you can stick that "good faith" argument in the same location where I tell people to stick their "go march in Pakistan with your PRIDE flag" arguments.
Edit: What a surprise, you "work in defense".
> In Crito, Socrates believes injustice may not be answered with injustice, personifies the Laws of Athens to prove this, and refuses Crito's offer to finance his escape from prison. The dialogue contains an ancient statement of the social contract theory of government.