That’s the problem with these types of allegations. If you’re treating a business deal involving a “onetime partner” as a Trump contact with the Russians, then there’s no limit.
Trump must have had hundreds of partners in his various business deals over the years, and each of these “onetime partners” has any number of other business ventures. It’s inevitable that you can find this type of link to Russian banks (or German, British, French etc. banks).
This is all nothing.
But hey, do you know how many people linked to the Clintons mysteriously turned up dead?