Hidden Assets in US?

Even a billionaire's wife is threatened with being backed into a settlement that is less than she deserves. Vladimir Potanin, the extremely wealthy Russian man behind the Sochi resort where the Olympics are being held, is in a legal battle with his estraged wife over their martial assets. He claims they made an oral agreement as to what she should recieved in a divorce. She says he is hiding assets in the United States. The legal battle continues. http://abcnews.go.com/US/divorce-worlds-richest-men-entangles-american-execs/story?id=22436291&page=2