http://en.wikipedia.org/wiki/Dmitry_Medvedev
IMO he looks ENTP Ti. Since Georgian president Mikheil Saakashvili is supposed to be an ESFp this could explain their fight (superego relationship). I usually argue with ESFp's and end up smashing them because of their poor
Perhaps Vladimir Putin (INTj IMO) "chose" him for running the country because they share the same quadra values thus they make good friends.