If Snowden could return to the US and receive a fair trial before a jury of peers then he would not be convicted of a thing.
So far all he has been guaranteed is a controlled trial where many things cannot even be mentioned...that is not a fair trial.
IMO, they would rather he remain a fugitive than allow a fair trial and endure the humiliation of losing in court.
There is no honour in the US justice system anymore...not when the FBI and DOJ are corrupt to the core.
He is a coconspirator with Comey...and Mueller. Goes back to 2004, when Comey and Mueller pulled that trick to block Gonzales from Ashcroft.
Snowmen will go to prison for life... fleeing thru China to Russia. He is literally a dead man walking. If you think he is some kind of whistleblower you are wrong.