China manipulates foreign public policy debates and influences elections by spreading disinformation and intensifying political differences in target countries. Chinese overseas influence operations stoke domestic political and social tensions, undermine support for the national government, sow distrust of the electoral system, and weaken support for alliances and partnerships with the United States. Washington should closely coordinate with Seoul to combat China’s covert efforts to sow discord in the alliance through a multi-faceted strategy to reduce Beijing’s ability to alter South Korean public opinion, government policies, and election results. Seoul must weigh any additional legislation against the potential for excessive government constraints on civil liberties—Seoul must be careful to not intervene too much in traditional and social media lest it jeopardize the institutions it seeks to protect.