<h1>US Treasury sanctions three Mexican banks for alleged cartel money laundering and fentanyl precursor financing</h1> The US Treasury Department imposed sanctions on three Mexican financial institutions, blocking their transfers and alleging they facilitated millions in money laundering for drug cartels and fentanyl precursor purchases from Chinese companies. Mexico's president strongly criticized the sanctions, stating the US provided no evidence despite repeated requests and that Mexican investigations found only administrative infractions. The sanctioned banks denied wrongdoing and demanded evidence. The Mexican leader emphasized national sovereignty, stating the country must be treated as an equal partner and rejecting unsubstantiated allegations.