(NEW YORK TIMES) — Arkady R. Rotenberg, a former judo coach, is now a billionaire industrialist, having made a fortune selling pipe to the state-owned gas monopoly, Gazprom.

Yuri V. Kovalchuk owned a minority stake in a small bank in St. Petersburg that in recent years won control of a number of Gazprom subsidiaries. He is now worth $1.5 billion.

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