From being a frontrunner in pressing China on the South China Sea disputes, the Philippines under President Rodrigo Duterte is seeking closer relations with China. In his state of the nation address in July last year, Duterte announced that he wants to begin a joint exploration venture with China in the South China Sea, in the area that Philippine government agencies refer to as the ‘West Philippine Sea’. The Chinese hailed the initiative as ‘full of political wisdom’.

A joint development project seems to serve both sides. Duterte may be engaging in conflict management and preventive diplomacy to ease regional geopolitical tensions and avoid confrontation with China. And he may be pursuing economic diplomacy to address the Philippines’ growing demand for energy security. The Malampaya gas field, for example, which supplies one-third of Luzon’s energy demand, will be depleted within a decade.

For China, a joint project would conform to its use of ‘neighborhood diplomacy’ (周边外交) to maintain a stable periphery. After all, Beijing’s professed stance on the South China Sea has always been about ‘shelving differences and seeking joint development’ (搁置争议, 共同开发). Working with the Philippines would also allow China to demonstrate the efficacy of bilateral arrangements while giving it access to new sources of energy.

But the situation is more complicated than it first appears. The joint exploration project involves both ‘disputed’ waters—waters within the Philippines’ exclusive economic zone but claimed by China based on its nine-dash line—and ‘undisputed’ waters that fall entirely within the Philippines’ territory or jurisdiction.

Take the disputed waters first. The Philippines has tried cooperation with China in disputed areas before. Former president Gloria Arroyo signed a joint marine seismic undertaking with China and Vietnam for the period 2005–2008 covering waters claimed by all three countries. And in a unilateral exploration attempt, Manila issued a concession for Reed Bank, located west-northwest of Palawan Island, but it met strong diplomatic and physical resistance from China. No work was completed and Reed Bank remains unexploited.

Technically, the Philippines could develop the West Philippine Sea on its own. In 2016, the Permanent Court of Arbitration (PCA) at The Hague ruled that China’s nine-dash line and associated claims of historic rights run counter to the UN Convention on the Law of the Sea. It also ruled that none of the geological features (let alone artificial islands) in the South China Sea count as islands, which means they can’t be used to determine maritime economic zones. However, China doesn’t recognise the PCA’s ruling and has the hard power to enforce its claims. If the Philippines were to unilaterally recommence exploration of the disputed waters, it would certainly encounter stern opposition from China once again.

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