I don't fucking care what Sanders or his campaign say. These two paragraphs perfectly summarize the allegations:
"It isn't clear precisely how much Russia is doing to help Sanders via the anonymity of cyberspace, but national security officials warned on Monday that social media agitation and disinformation have continued through this year's presidential race.
A statement signed by top Trump administration officials stressed that foreign actors were spreading "false information and propaganda about political processes and candidates on social media in hopes to cause confusion and create doubt in our system."
Zero evidence presented. But credulous rubes like you will gobble it up because it's what you want to hear.
Are you so far off the deep end that now you're ignoring that Facebook deactivated Russian troll accounts, a number of which were dedicated to boosting Sanders?
You're just so far off in conspiracy theory la la land you're unable to confront reality. Russia supports Sanders' campaign and anyone living in the real world acknowledges that. Stop acting like a Trumpkin.