The American CIA reportedly believes that the Russians, in the form of the Russian government and possibly private actors, went to signficant length (psych / cyber ops) to help Trump win.
Having said that, could you provide a clear explanation of exactly why they would want that?
The only explanation I've seen in the news is some vague reference to it having something to do with past business relationships with Russian billionaires. Is that complete/accurate?
Is it just gratitude for past business deals or would they expect Trump to benefit them in the future as well (or is there some other element)? It couldn't have anything to do with his wife, could it? If not for the business relationships, I would've expected the Russians to prefer a Democrat, as Republicans are (in my perception) typically viewed as more aggressive towards rivals and less co-operative in international affairs.
Note: Retrospectively this question is similar to a couple of others so I won't dispute it being marked as a dupe, but I think it's more broadly focused and has some good unique answers.