I honestly think the Russians tried to keep Trump in the dark as much as possible and ordered their cronies actually trying to infiltrate the campaign the same thing.
They wanted to fuck things up because Putin believed Clinton had organized protests against his regime as secretary and the result of them easily hacking her emails(which were in hindsight probably hacked by every foreign intelligence service) was even better than the Russians could've predicted.
In the end Mueller found a lot but he didn't find the smoking gun connecting the GRU to the Trump family and even the money trail through Deutsche Bank went cold.
Kushner and Jr. talked to Israeli agents and made encrypted calls to the head of Nascar for some reason. Kushner even wanted to use the secure lines at the Russian embassy because the Trump Org didn't have those, and the Russians refused.
Can you imagine what that must've been like for the investigators. Expecting to find a trail to the Kremlin only to end up in the swamp of the Trump Organization and all the weird characters connected to the Trump verse.
Plus the asinine idea to build a Trump Tower in Moscow. "Our boy can be President, we can have Ivanka sit on Putin's chair!"
What made the case for collusion even weaker was in fact the FBI agents messaging back and forth about what an idiot Trump was and that they would need some sort of 'insurance policy' against him.
And finally there is the small detail of the dossier about Trump and the Russian hookers having a golden shower on Obama's bed, which was spread as misinformation.
Whatever happens during the 2020 campaign, it'll be hard to top this level of crazy. If someone had written this as a movie script it would've been shot down for not making sense.