Russian electoral collusion is a conspiracy theory.
Yep. Zero evidence, too.
And, political collusion isn’t necessarily illegal in any case.
I believe the only law that I’ve ever hear of forbids financial donations from foreign entities. It would also be illegal to agree to promote any otherwise illegal act like theft, killing opposition, etc.
Is it illegal, for example, for Putin and Trump to agree to comment on Hillary’s bad health?
I don’t think so.