Though many bills died on the floor, members of Congress seem to introduce legislation in reaction to major events (such as the Russian annexation of Crimea in 2014).

Note: This chart represents individual instances in which lawmakers in either chamber of Congress introduced legislation related to sanctions on each of these countries. Some of the bills appear in comparable or even identical iterations across the chambers and across the different Congresses over time. The data is is more representative of activity or even reactions from lawmakers, rather than actual, codified U.S. foreign policy. Source: Congress.gov.