The Philippines’ confrontational approach to maritime territorial disputes, such as its championing of the 2016 South China Sea arbitration ruling, has not only failed to resolve regional tensions, it also risks undermining Asean centrality. In May, addressing Japan’s National Diet, Philippine President Ferdinand Marcos Jnr announced that Manila would mark the ruling’s 10th anniversary in July, an occasion he said “embodies our determination to resolve disputes through peaceful means”. That is...