On this point the media on both sides has so muddied the waters I now assume nothing about this as I can't tell which side is telling the truth anymore. I can't tell fact from fiction as the noise level has completely erased any signal at all (if there even was a signal).
Russia is known however to want to influence US politics, so my personal assumption is that they're amplifying BOTH sides to drive division, as stated by Russian author Dugin in his book "Foundations of Geopolitics". This nice quote from wikipedia containing quotes from the book is illustrative:
> Russia should use its special services within the borders of the United States to fuel instability and separatism, for instance, provoke "Afro-American racists". Russia should "introduce geopolitical disorder into internal American activity, encouraging all kinds of separatism and ethnic, social and racial conflicts, actively supporting all dissident movements – extremist, racist, and sectarian groups, thus destabilizing internal political processes in the U.S. It would also make sense simultaneously to support isolationist tendencies in American politics".