The bank said that it had received the request from the U.S. Treasury Department's Office of Foreign Assets Control (OFAC) in January to "clarify payments business and related processes maintained by RBI in light of the recent developments related to Russia and Ukraine."

The bank said it was cooperating fully, adding that it had processes in place to ensure that it complied with sanctions.

(Editing by Paritosh Bansal and Anna Driver)

By John O'Donnell, Francesco Canepa and Alexandra Schwarz-Goerlich