Russian revenge: Some firms could face retaliation By: CNBC.com News April 25, 2014 at 12:34 PM EDT "Companies with money tied up in Russia would have a tough time getting it back out," says one foreign policy analyst. Read More >> Related Stocks: Alcoa BP Plc ADR Boeing Co Exxon Mobil MasterCard Oao Gazprom ADR Royal Dutch Shell Cl B ADR Visa