The Supreme Court spoke clearly early this year when it ruled that a 2005 oil exploration deal between the Philippines, China, and Vietnam—often touted by more pragmatic politicians and business leaders as a model for solving the territorial impasse in the West Philippine Sea—was, after all, unconstitutional. Thus, the High Tribunal, which is the ultimate authority when interpreting the provisions of the country's fundamental law, has set down as plainly as possible for local policymakers and their foreign counterparts to see what is feasible going forward and what it not.

https://opinion.inquirer.net/162304/nonnegotiables-in-china-oil-talks

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