After some of Russia's richest oligarchs were cut out the global financial system, billionaires Mikhail Fridman and Pyotr Aven vowed to contest European Union sanctions imposed in retaliation for the invasion of Ukraine.
Russia's economy is facing one of the gravest crises since the 1991 fall of the Soviet Union after the West imposed crippling sanctions on almost all of the Russian financial and corporate system following the Kremlin's order for a military operation.
