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Bloomberg estimates Ukrainian oligarch Rinat Akhmetov's assets at US$5.9 billion.

"Rinat Akhmetov has survived revolution, war and nationalization of assets. His fortune has tumbled from its highest level in 2013 after a revolution in Ukraine erupted into conflict with Russia and the annexation of Crimea. Yet he continues to be Ukraine's richest person and the 52-year-old is even making a comeback with a fortune of $5.9 billion, according to the Bloomberg Billionaires Index," Bloomberg reported.

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Akhmetov owns System Capital Management, the country's largest industrial conglomerate, whose most valuable assets are steel company Metinvest, and DTEK, a coal and energy business.

Akhmetov, an avid supporter of former President Viktor Yanukovych, was forced to move from his native Donetsk to Kyiv after Russia unleashed aggression in Donbas and his wealth slid from a high of $22.4 billion in January 2013.