Putin knew that all Donnie wanted was banks to lend him money -- he didn't care where it came from as long as they flattered him. Since no Western banks with the exception of the corrupt Wells Fargo and the troubled Deutsche Bank were willing to do so after the 1990s that provided a perfect opportunity to use the Russian banks (which exist only at the sufferance of the Kremlin) and certain Cypriot banks (laundries that are Russian in all but name) as cut-outs in an influence campaign.*
Putin's goals in exerting that influence started modestly: undermining confidence in Western democratic institutions and the EU and NATO by making sure the campaign of a right-wing populist would give establishment candidates a run for their money. The hacking, the troll armies, the disinformation campaigns that were used during Brexit and European elections also supported this goal.
When he actually won the primary the goal shifted to inserting pro-Russian advisors into the campaign: scum like Manfort, Flynn, Page, etc. His lenders at the Russian banks were only too happy to "suggest" who the best, really the most luxurious people would be to advise him on foreign policy.
And then, when he won the general election it was party time: trying to transform all that advice and suggestions into real policy that would isolate the U.S. from Europe and NATO while lifting sanctions.
So without any explicit quid-pro-quo, that December meeting between Kushner and Gorkov during the transition period was no doubt about discussing "promising trends and sectors with influential financial institutions in Europe, Asia and the United States" -- trends that the new regime's cronies and the oligarchs in Russia would make sure would come to pass over the next four years.
[* I predict that we'll be seeing that report about Alpha Bank pinging the grifter's corporate servers and the former MI-6 analyst's allegations about other Russian banks resurfacing as the investigation proceeds. If there was true stupidity and greed at work the mysterious Rosneft sale story might also re-emerge]