Ah, good eye. IANAL, and I missed that part. The Permanent Court of Arbitration has written their own argument for jurisdiction [0]. Having flipped through it,

Ah, good eye. IANAL, and I missed that part. The Permanent Court of Arbitration has written their own argument for jurisdiction [0]. Having flipped through it, I don't have the legal background to form a strong opinion in light of China's declaration. I'd lean towards "don't build on reefs in another country's Exclusive Economic Zone," but I'm neither a court nor plaintiff with standing :) [0] https://www.pcacases.com/web/sendAttach/1503 https://www.pcacases.com/web/sendAttach/1503