Mr Berezovksy had four children - Arina and Gleb with first wife Nina and Anastasia and Artem with Galina Besharova.

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Others, such as Gleb Pavlovsky, a weathered Kremlin spin-doctor, have been trumpeting Mr Medvedev's emergence as an independent and powerful leader.

ECONOMIST: Russia's political leaders

Gleb Yakunin, a liberal cleric, says the campaign against the exhibition is driven by fanatics akin to the revolutionary guards that preserve Iran's Islamic regime.

ECONOMIST: Church and state in Russia

"There is just a lot of uncertainty right now and it shows with sector underperforming this year so far, " says Gleb Zarkh, an equity analyst with Talon Asset Management.

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