That's clearly nonsense, his wealth is from real estate mostly in the US. That's basically it.
He's not a good businessman, quite the opposite, he's had multiple failed businesses over the years but he's wealthy simply because he was long real estate over a few decades after inheriting real estate from his wealthy father.
I think perhaps you're confusing things like him selling his property in Florida to some Oligarch or maybe some Russian nationals investing in some real estate venture in NYC.
Anyway it seems rather silly to try and use things like that as an argument, there are plenty of things to criticise Trump over w.r.t his views on NATO, Russia and Ukraine without needing to indulge in fantasy/conspiracy theories.