币界网报道：U.S. Senator Marco Rubio has called for sanctions against Russia's use of cryptocurrency to evade international financial restrictions, warning that digital assets could undermine efforts to isolate Moscow economically. In a letter to Treasury Secretary Janet Yellen, Rubio highlighted concerns over Russia potentially leveraging crypto to bypass sanctions imposed due to its invasion of Ukraine. He urged the Treasury Department to take preemptive action, citing reports of Russian entities exploring crypto-based payment systems. Rubio emphasized the need for stricter oversight on exchanges and DeFi platforms that may facilitate such transactions. The senator's push aligns with broader U.S. efforts to close loopholes in sanctions enforcement, as policymakers increasingly scrutinize crypto's role in global finance. This development comes amid growing regulatory focus on digital assets' compliance with anti-money laundering and national security protocols.