Russian President Vladimir Putin toasts with Sergei Ivanov (center) and Valery Gerasimov (right), two individuals recently sanctioned by the US.Mikhail Svetlov/Getty Images The US Treasury sent out an alert on Monday outlining "red flags" of potential sanctions evasion. It told banks to "be vigilant" of Russian oligarchs and state actors attempting to skirt sanctions. Sanctioned individuals may try to use cryptocurrency to complete transactions, the alert warned. The US Treasury Department issued a Financial Crimes Enforcement Network (FinCEN) alert on Monday that instructed financial institutions to be "vigilant" of Russian oligarchs and state actors attempting to dodge sanctions with cryptocurrency.