An Austrian official said that Austrian authorities were monitoring the situation at Raiffeisen and its business in Russia closely because of the bank's importance.
Almost a year since Moscow launched what it calls a "special military operation" in Ukraine, Raiffeisen is among a handful of European banks that remain in Russia.
Raiffeisen made a net profit of roughly 3.8 billion euros last year, thanks in large part to a 2 billion euro plus profit from its Russia business.
Alternatively, OFAC can also resort to less stringent measures such as levying fines and sending warning letters over sanctions violations.
OFAC has sanctioned five major Russian banks, including state-backed Sberbank (SBER.MM) part of a response to that country's invasion of Ukraine, as well as wealthy oligarchs.