China’s new Regulation on Countering Unjustified Extraterritorial Jurisdiction by Foreign States introduces a potentially significant conceptual shift in the global debate over jurisdictional conflicts. Rather than asking only whether a foreign state’s exercise of jurisdiction is lawful under international law, the Regulation creates a further requirement: that such jurisdiction be “justified.” Zheng (Sophia) Tang writes that the “justification” standard has the potential to influence the development of customary international law.