Bankers are convicted of allowing a Putin ally to deposit millions in Swiss accounts.

GENEVA Four bankers have been convicted of failing to conduct due diligence on Swiss accounts that were opened in the name of a musician with close ties to President Vladimir V. Putin of Russia and used to make deposits worth tens of millions of dollars.The bankers, who led the Swiss unit of the Russian lender Gazprombank, helped to move millions of Swiss francs through two accounts opened for the musician, Sergei P. Roldugin, a concert cellist nicknamed Putin's wallet, from 2014 to 2016.

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