European Union nations may boast the world's most stringent anti-money laundering rules, but recent scandals show that criminals are good at exploiting the bloc's Achilles' heel: A patent lack of coordination.
"There are problems relating to coordination at various levels: at the national level, between prudential and anti-money laundering institutions, and between states and the European Union," said Laure Brillaud at Transparency International EU.
According to the probe, "a large part" of transactions totalling 200 billion euros ($235 billion) at that branch were "suspicious".
A big chunk of the allegedly laundered funds came from Russia, while the second-biggest group of non-resident customers were UK corporate entities. Britain has announced a probe into the activities of these companies.
Also this month, Dutch banking giant ING axed its top financial officer following a scandal over the firm's failure to vet clients for potential money laundering activities.
In March, Malta's financial services watchdog froze the assets of Pilatus Bank after the bank's chairman was arrested for allegedly circumventing US sanctions in Iran.
And in February, US authorities accused Latvia's third-largest lender ABLV of large-scale money laundering with connections to North Korea's nuclear weapons development programme.
Other European banking giants, including HSBC, Societe Generale and BNP Paribas have been fined millions of dollars in recent years for failing to put in place sufficient anti-money laundering controls.
"It's a good sign that these cases are coming to light, but it remains a concern that the United States has to flag the problem," said Brillaud at Transparency International EU.