I believe Snowden has been able to hold onto the encryption keys....That Putin does not have them...yet
There was an article in Gizmodo the other day about how the Russians are all of a sudden ordering typewriters and ribbons because they're pulling their intelligence offices off of networks and back on to hardcopy paper documents. So what do you suppose caused the sudden change in operating mode? Why had China suddenly been all up in arms on specifics of outside agencies hacking into their computers? Anyone who thinks that China and Russia are supporting Snowden out of the goodness of their hearts is delusional. Both countries got well paid in the only currency Snowden has, our secrets. Putin has already gotten his intelligence bonanza.
As for encryption keys, any that Snowden had have long since been changed.