Japanese regulators ordered Citigroup on Friday to suspend advertising and other promotional activities in its retail banking division in Japan for a month for compliance violations and for failing to monitor suspicious transactions.

The regulator, the Financial Services Authority, said Citigroup’s Japanese unit, Citibank Japan Ltd., had failed “to make notification of suspicious transactions, including money laundering.”

It cited fundamental problems with the bank’s compliance and governance system.

“C.J.L. has not accurately identified a series of problems that were recently found,” the agency added, “and the effectiveness of the internal audit has not been ensured.”

The suspension, which is to begin July 15, means that the bank will be prohibited from advertising, soliciting customers or using publicity in relation to its retail banking products.