US Secretary of State John Kerry invited Snowden to "man up and come back to the United States."
"The bottom line is this is a man who has betrayed his country, who is sitting in Russia, an authoritarian country where he has taken refuge," Kerry told the CBS network.
"If he has a complaint about what's the matter with American surveillance, come back here and stand in our system of justice and make his case," Kerry said.
More top news
Doctors have warned that plans for "brutal " NHS cuts are shrouded in secrecy and will cause uproar once revealed.
A man had a "miracle escape" when his £200,000 Ferrari careered off a motorway and into a field - just an hour after he bought it.
Hundreds of towers across England were discovered to have fire safety flaws including broken fire doors and holes, new figures show.