On July 12, 2016, the arbitral tribunal adjudicating the Philippines’ case against China in the South China Sea ruled overwhelmingly in favor of the Philippines, determining that major elements of China’s claim—including its nine-dash line, recent land reclamation activities, and other activities in Philippine waters—were unlawful. Predictably, China reacted negatively to the ruling, maintaining it was “null and void.” China may take assertive and inflammatory steps to defend its position. The extent to which China abides by the ruling in the long term, and to which the international community supports and seeks to enforce the ruling, will have consequences for the utility of international law as a tool to ensure the peaceful, stable, and lawful use of the seas going forward.