There is no benefit to Mr. Snowden in returning to the heart of the beast
Given the current administration's (and probably prior/future administrations) for slamming whistle-blowers, I totally expect that Mr. Snowden would, at best, be cubby-holed in yet another dark/dank space where his liberties were as close to absolute zero as possible.
I think he has done a huge amount of benefit to the the world in general and should be welcomed with open arms by most democracies. Unfortunately, most "democracies" are in name only and are controlled by bigger partners (US, UK, intelligence agencies, corporations.)
It used to be that the Scandinavian countries (Finland, Norway, Sweden, Denmark) were some of the most open to dissent and accommodating of dissenters. I'm not a geographer, but I can see some nice direct routes from RU to any of these countries without crossing US-guarded no-fly zones.
What happened to make people like Assange into supposed criminals by the Swedes? Why aren't they offering safe harbour to Snowden? Could it be that the US had extended its tentacles deep within each of those countries' political system? Shame.