We know that the Trump campaign wanted to collude with the Russians, because Trump himself publicly asked for their help during the campaign. We also know that the Russians wanted to collude with the Trump campaign and reached out to them through various campaign members, several of whom have since been indicted. What we don’t know is whether they were ever actually able to collude in private. In my opinion, if they didn’t manage it, it’s probably down to incompetence.
There was a Russian plot to undermine the 2016 elections, and that there is likely to be a similar plot for 2018.