I'm not aware of there being a single lick of evidence to suggest that kookery, but even if he was a Russian agent, he certainly accidentally provided Americans a laudable service.

You mean a Russian asset like Comrade Krasnov?

The USG does not seem to believe that Snowden was a Russian agent.

Russia feels it has an interest in informing the American public on the depths of illegal behavior of their own government?

Why is this a problem?