Abramovich – What is his relationship with politicians and Putin in particular?

Chris Hutchins, a biographer of Russian Prime Minister Vladimir Putin, claims that the relationship between the former Russian president and Abramovich is like that between a father and a favorite son; Abramovich himself has stated that his relationship with Putin is professional, as signified by his use of the Russian language's formal "вы" in addressing Putin, as opposed to the informal "ты"

Source: Wiki