Today Snowden says, "I did not partner with any foreign government" -- but there was this:
... Snowden asked for a guarantee that The Washington Post would publish within 72 hours the full text of a PowerPoint presentation ... He also asked that The Post publish online a cryptographic key that he could use to prove to a foreign embassy that he was the documents source ... I told him we would not make any guarantee about what we published or when. Snowden replied succinctly, I regret that we werent able to keep this project unilateral. Shortly afterward he made contact with Glenn Greenwald ...
Code name Verax: Snowden, in exchanges with Post reporter, made clear he knew risks
By Barton Gellman,June 09, 2013
http://articles.washingtonpost.com/2013-06-09/world/39856622_1_intelligence-powers-single-point
So when he first provided material to the Post, he was expecting the Post to help him somehow establish his bona-fides with a foreign embassy