How he will get there is another matter, he'll have to cross at least two other countries and we've already seen a plane ordered down in order for it to be searched. Whether some nation in the flightpath from Russia to Switzerland would have the required fortitude to do that to a plane owned by the Swiss government is another matter entirely.
Pissing off Bolivia is probably a mild '2' in international relationships, pissing off the Swiss would likely rate a '9' or so.
A great circle from Moscow to Zurich passes through Belarus, Poland, Czech Republic and Germany, however if you went from Volgograd to Zurich you would go straight through eastern Ukraine.
Apart from M99551 from Motor Sich Airlines, which is headed to Kharkiv.
edit - actually it looks as though it is going past Kharkiv as it is still climbing.
Anyway, these days when people are talking about the Eastern Ukraine in terms of an area that you should not be flying planes over they are not quibbling over facts of geography but in relation to the ongoing attempt at secession in the Eastern part of the Ukraine. If you wish to have it specified by google map coordinates, lists of cities, an animated map of the moving frontier then I could probably comply with the demand but it isn't worth the trouble.
Currently 'don't fly your civilian aircraft over Eastern Ukraine' is something that you could take either as person informed about current events or as a cartographer.
By your standards we don't have a 'middle America', there is no 'eastern Cyprus' and so on.
It's contested territory at best right now, quite possibly at some point in the future it won't be called Ukraine at all.
By my standards, eastern Cyprus is the eastern parts of Cyprus and middle America is the people in America who share a conservative rural culture, though where they live is almost incidental, much like middle England.
And I have been reading the news, however I do not rely on it if looking for actual facts about where commercial carriers are flying.
This is because journalists are generally really lazy and unreliable for anything other than a broad brush view of things, a view which you are now regurgitating unprocessed.
You haven't really substantiated your claim. I assume the parent poster was referring to the fact that Snowden is (potentially) a very valuable asset.
Snowdens main value to Russia has so far been of the PR variety (And mostly for the home front at that, 'sticking it to the USA').
If you wish to make the case that Snowden will not be permitted to leave Russia then I think that is the claim that needs substantiation, rather than the opposite.
Maybe you're right and they won't let him go but that would need a plausible scenario first.
The only plane that probably would be safe is the Russian presidential plane.
http://www.bbc.com/news/world-europe-28986764
The article doesn't say that the machine was a civilian Aeroflot machine, but this German article mentions it:
http://www.spiegel.de/politik/ausland/polen-russischer-minis...
If search on Google you'll see that this has happened to multiple Russian officials (like Dimitri Rogozin) in the last months.