The whole Russia, Russia, Russia thing was a complete projection of what a Russian wet dream might look like on a perfect day. It never happened. There is no evidence that it happened. Any investigation is a total futile effort by underlings to attempt to find something to make their boss happy, but it is not to be found. A complete waste of taxpayer resources in an attempt to attack the one that defeated Her Thighness.
As I used to comment on minor cases - This investigation is complete as evidence does not support a presentation to the U.S. Attorney, and it is also the known attitude of the U.S. Attorney to decline prosecution on a case without sufficient evidence to support a charge.
But the total lack of evidence is proof of how well Trump hid it.
I learned this from Tom Foley, when he accused George H W Bush of flying in the back seat of an SR-71.
Not exactly true.
It did happen, just not with or about Trump.
The investigation was done by Obama to use against Hillary in the battle to see who would be the Democrat Party Choice for President back for the 2012 election. She backed down, he won the nomination. The report was shelved.
When Trump won, the report was rewritten using Trump's name instead of Hillary's. The report was sent to Britain to 'launder' it's source. McCain presented it as if it were original and done by the British Intelligence Services.