Russia’s biggest lender, Sberbank, is investigating a potential leak of its customers’ personal data, the bank said on Thursday, as the Kommersant newspaper reported that the leak may be the biggest ever in the history of Russian banking.

The corporate world has gotten a shock of its recently when the data protection enforcement body of Greece has imposed a fine under Article 83 of the GDPR amounting to 150.000 EUR on PricewaterhouseCoopers.