The two sources are both from the US intelligence -- the same intelligence community that sold us the debunked "Russia hacked the US election" story. The same intelligence community that The Intercept reports as being increasingly powerful political actors and manipulators in the US, and that The Intercept reported as having an interest in undermining the democratically-elected Trump administration, and by extension the democratic process itself.
All the other parties involved -- the US government, the Russian government, Edward Snowden & friends -- deny the story.
There are no other sources other than the US intelligence, and they have a recent history of lying for political reasons. They're not credible sources. Plainly, it's bullshit.