Outside the rarified sphere of the super-rich, tycoon Viktor Vekselberg is mostly known in Russia for spending more than $100 million to bring cultural artifacts back to his homeland, including an array of Faberge eggs glittering with gold and jewels.
By Vekselberg's standards, the money he laid out wasn't all that much: His fortune has been estimated at about $14.6 billion.
But after his holding company Renova was hit by U.S. sanctions against Russia in April, his worth appeared to shrink markedly, and he reportedly has asked the Russian government for help to stay afloat.
Now Vekselberg is facing new scrutiny.
U.S. news reports said he has been questioned by...