BBC Panorama/screenshot
Anatoly Kucherena, Snowden's Russian lawyer, told RIA Novosti
Snowden remains in contact with Russian intelligence services, according to the Associated Press, and has been a vocal supporter of WikiLeaks, which itself is linked to Russia.
On Tuesday, when Chelsea Manning, a former US Army intelligence analyst and fellow WikiLeaks whistleblower had her sentence commuted by Obama, White House spokesperson John Earnest said the following of Snowden's case:
"Mr. Snowden fled into the arms of an adversary, and has sought refuge in a country that most recently made a concerted effort to undermine confidence in our democracy."
In light of this stance, it seems unlikely that Obama, or any US president, would consider pardoning Snowden until he returns to the US to face charges as Manning did.