There is much information and I think some might become evidence, but direct collusion with the Trump campaign may be difficult. We see how the Russians work in the fake letter in FBI files that caused the miscalculation by Comey, and from reports on their tactics in Congressional hearings-- they get innocent information and play people with it. Like a conversation with Kushner could be things like: what is your position going to be? What is Ivanka doing? Or is it true what we hear about Tillerson becoming Secretary of State. Or: Bannon is a weird guy-- does he have a girlfriend? Their hacking and fake news required help from people close to the campaigns. See the Wall Street Journal interview with Aaron Nevins a GOP campaign analyst who reached out to Gucifer 2 the Russian hacker and got stolen DNC documents and several gigabytes of voting data. In turn he gave Gucifer 2 help with the data. Nevins then turned the data over to Roger Stone one of Trump's advisors, but no collusion.