From the Document: "On February 24, the Russian Federation (Russia) launched a full-scale invasion of Ukraine. The United States and allies have responded with sanctions and other actions, affecting economic engagement, access to financial instruments and resources, and trade, against Russia that are unprecedented in terms of their comprehensiveness, coordination, and swiftness. Within the United States, the new measures were primarily imposed by the executive branch. Congress has sought to widen the range of economic targets and to curtail further the Russian government's access to financial and other resources."
CRS In Focus, IF12062
Congressional Research Service: https://crsreports.congress.gov/