It looks like a case of the bigger they are, the harder they fall: Konstantin Strukov, one of Russia’s wealthiest businessmen and once close to President Vladimir Putin, is now facing criminal charges and the threat of state asset seizure. His flagship company, the gold mining firm Uzhuralzoloto, is set to be nationalized by the Russian government amid a broader wave of corporate takeovers by the state. With an estimated fortune of $1.9 billion, Strukov comes 78th on Forbes' list of Russia’s richest people. In addition to his business ventures, he was also active in politics, having served as deputy...