After watching two of his interviews in Russian he sounds like Ni-EIE to me. What is interesting from those interviews is that he almost never refers to himself in 1st person but will consistently uses "we", "us" or "our" as in "our economy", "our society", "our plan", "we have decided that" etc. It is as if he feels himself to be perfectly integrated with whatever social networks that surround him. His descriptions of himself are rather dispassionate. During the interview he next to never corrects the interviewer on his line of reasoning but instead slides into descriptive mode to demonstrate his own point of view. On a few occasions he describes incorporating his own systems into practice. Often will describe how something works and delineate on-going processes. Sounds aristocratic, dynamic, extraverted, Fe+Ti, Ni-creative to me i.e. EIE.
one of the Russian interviews:
YouTube - Михаил Прохоров