1 The Deep State with all its intelligence agencies moved heaven and earth for a solid  10 years to prove Trump was controlled by Russia. Nothing. Had to invent ludicrous "golden shower" and other evidence for an impeachment that failed.

2 Trump is now 10 times more powerful than Putin. If by some impossible odds he truly was a Russian agent, why should he not cut free to do his own, very popular agenda?

3 Can Russia spill the beans on him now and marr Trump's legacy? No, since what Trump's done or achieved has already made him a legend. Besides he's not likely to play nice with those who blackmail him.