It is usually difficult to definitively ascertain where a hack comes from. The CIA has a program, UMBRAGE, that makes it even harder. From L. Reichard White at lewrockwell.com:
Everyone immediately knows they all come from Russia, probably from Vladimir Putin himself. Afterall, the U.S. auto-responder says so.
This guy knows – – –
“Vladimir Putin, as many people in this chamber know well, wakes up every morning and goes to bed every night trying to figure out how to destroy American democracy.” –House Trump Impeachment Manager Jason Crow
The world’s a small place. Who else would do it?
Well, OK, there are interests in the world which need Russia as the Essential Villain so they can have an excuse for iffy things like backing out of nuclear arms limitation treaties and spending one trillion dollars to modernize their nuclear weapons for example. So the nuclear part of the U.S. MilitaryIndustrialCongressionalComplex might have a motive to blame Russia. In fact, the whole Complex does.
And there is the cheap propaganda factor. We Americans have a tendency to confuse the Communist former USSR with capitalist anti-communist modern Russia. That makes it easy for anyone who needs an excuse for something to get one on the cheap. They just demonizize Russia by resurrecting the Cold War.