My honest opinion is that Trump himself is too stupid for the Russians to involve him. They simply involved several around him. He's also too stupid to read his loan documents for his properties (they have to give him national security updates in no more than one page, with diagrams). So he probably got involved in the Russian money laundering schemes without realizing what he was doing.

But he knows he did something. Because he was desperate enough to fire Bahara, Yates, and Comey, and trying his best to discredit Mueller.

Is Trump Russia’s Useful Idiot, or Has He Been Irreparably Compromised? – Foreign Policy

What if the Trump campaign was too stupid to collude?