South Korea’s recent pressure campaign against American companies should serve as a warning to policymakers in Washington: Foreign governments are increasingly using regulation as a weapon against successful U.S. firms. It’s time to push back on them. 

Last month, Republican lawmakers raised concerns about the South Korean government’s treatment of American tech companies operating in the country. Their letter highlighted threats of punitive fines, possible business-license actions, and an expansive investigation into a data breach involving the U.S.-based e-commerce giant Coupang.