Russia's VTB holds 9.6 pct in En+ after AnAn margin call -bank executiveReutersMOSCOW, May 25 (Reuters) - VTB, Russia's second-largest lender, has increased its stake in sanctions-hit En+, which manages the aluminium and hydropower assets of businessman Oleg Deripaska, after making a margin call on one of En+'s minority ...and more »