The verdict is in. An arbitration court at The Hague struck down China’s claims to a huge part of the South China Sea. Under principles in force since the 1600s, the court said China had no basis for its outrageous grab of international seas and the territorial waters of the Philippines, Vietnam and others. But China will respond and this issue will not go away. It represents a challenge for the next president, but resolving it could provide an opportunity to strengthen regional ties and nudge the Chinese regime in a productive direction.