4 bankers have been accused of helping Putin launder $50 million through Switzerland via his cello-playing best friend

• A cellist is accused of helping Vladimir Putin channel $50 million into Swiss accounts. 
• 4 bankers are also accused of not having checked the real source of the money. 
• Putin is believed by some to have accrued vast wealth during his time as Russian leader. 

Four bankers have been accused of helping Vladimir Putin's cellist best friend channel millions of dollars through Swiss bank accounts for the Russian president.