The Treasury Department wants U.S. banks and other financial institutions to monitor for suspected Iranian money laundering networks that use their funds to smuggle sanctioned oil through shell companies and crypto networks. The move, which effectively deputizes the global financial system to help disrupt Iran’s sanctions-evasion infrastructure, comes as the U.S. and Iran reached another impasse over how to end their war while their ceasefire has grown increasingly shaky. President Donald Trump on Monday said the Iran ceasefire is on “life support” after he rejected Tehran’s latest proposal to end the war. The Trump administration is calling on banks to flag certain customers who may launder funds for Iran’s Revolutionary Guard — including newly formed companies moving unusually large amounts of money, firms that route payments through multiple intermediaries or transactions connected to Iranian crypto firms, among other indicators. As part of the U.S.…