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
A towing vehicle has hit a passenger plane at Glasgow Airport after sliding on ice. The British Airways plane was preparing for take-off.
Vaginal mesh implants are designed to help deal with incontinence and other problems following childbirth.
Ice warning in force across northern and western areas.