Bill Browder, (pictured) who ran Russia s largest foreign investment fund until falling foul of Putin, said the deaths reveal a vicious fight among Moscow s elite to cling on to their wealth.
Mystery deaths of Russian oligarchs from killer hangover cure to bloodbath suicide dailystar.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailystar.co.uk Daily Mail and Mail on Sunday newspapers.
Konstantin Goloshchapov, 67, crossed the border from Russia into Belarus back in June at the wheel of son Dmitry s BMW after reportedly receiving a tip-off that his businesses were about to be raided.
Viktor Cherkesov, a close KGB spy mentor of Vladimir Putin s who suffered demotion after daring to publicly criticise the Kremlin leader, has died from an unexplained serious disease .