Excerpts from the diary, and some of his other personal effects, will soon form part of an interactive display in the museum's Colossus gallery which is currently in the middle of a refit.
BP's belief is that the oligarchs regret the way they frustrated last year's attempt by the British oil giant to form a joint venture with the Russian state-owned energy colossus, Rosneft, which could have involved Rosneft buying out the oligarchs.