I'd be worried about the Russians putting him in jail if the US pardoned him.
Why? He did nothing to deserve punishment in Russia. If anything, if Snowden left, I think Putin would be relieved he doesn't have to treat a potential nuisance with utmost care anymore. At the moment he can't really disappear him and has to waste resources monitoring him.
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I don't think Putin would want to taint his relationship with Trump on his first week on the White House.
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