The Russian meddling in 2016, the Mueller Report and the Ukraine scandal are all intimately intertwined.
Why is there even a Ukraine scandal at all? Ask Paul Manafort, who originally received the cover idea that the 2016 meddling came from Ukraine, not Russia, from the mouth of Konstantin Kilimnik, who got the idea from.......somebody somebody ..... Russia/Putin.
What crazy thought process would motivate Ukraine to attack the U.S. that way? None. U.S. Intel tracked the servers to a Russian address. period.