Earlier quoted context omitted.
> almost certainly What are you criteria for near certainty and what evidence-supported claims are there that satisfy those criteria?
I don't think we have any document released yet that describes any full picture. We do have this statement (and a little more detail inside) in a report by a joint report by the US Intelligence Community (regarding Russian interference with elections): "We assess with high confidence that Russian military intelligence (General Staff Main Intelligence Directorate or GRU) used the Guccifer 2.0 persona and DCLeaks.com t…
It's a joint report by the US Intelligence Community. There is no “US National Intelligence Agency”; the position of Director of National Intelligence was created to specifically split the role of overall head of the intelligence community (the DNI) from the head of a particular agency (the overall head of the IC used to be the Director of the CIA.)