Greenwald told The AP that he deliberately avoids talking to Snowden about issues related to where the former analyst might seek asylum in order to avoid possible legal problems for himself.
Snowden is believed to be stuck in the transit area of Moscow's main international airport, where he arrived from Hong Kong on June 23. He's had offers of asylum from Venezuela, Nicaragua and Bolivia, but because his U.S. passport has been revoked, the logistics of reaching whichever country he chooses are complicated.
Still, Greenwald said that Snowden remains "calm and tranquil," despite his predicament.
"I haven't sensed an iota of remorse or regret or anxiety over the situation that he's in," said Greenwald, who has lived in Brazil for the past eight years. "He's of course tense and focused on his security and his short-term well-being to the best extent that he can, but he's very resigned to the fact that things might go terribly wrong and he's at peace with that."
Greenwald said he worried that interest in Snowden's personal saga had detracted from the impact of his revelations, adding that Snowden deliberately turned down nearly all requests for interviews to avoid the media spotlight.
Asked whether Snowden seemed worried about his personal safety, Greenwald responded, "he's concerned."
He said the U.S. has shown it's "willing to take even the most extreme steps if they think doing so is necessary to neutralize a national security threat," Greenwald said. "He's aware of all those things, he's concerned about them but he's not going to be in any way paralyzed or constrained in what he thinks he can do as a result of that."
Asked about a so-called dead man's pact, which Greenwald has said would allow several people to access Snowden's trove of documents were anything to happen to him, Greenwald replied that "media descriptions of it have been overly simplistic.