Our failure to ratify the treaty also undermines our ability to fully work with our allies and partners in the South China Sea region. If we are not party to UNCLOS, it is difficult for the United States to rely on the treaty to determine the legal entitlements of mid-ocean features, which claims are lawful, and what exactly constitutes the high seas. It’s also harder for us to suggest it as the basis for resolving claims and arbitrating disputes — or to rely on EEZs drawn under UNCLOS’s auspices. Moreover, a broad set of stakeholders including the U.S. Chamber of Commerce, environmental organizations, the military, and industry specific trade groups representing commercial fishing, freight shipping and mineral extraction all support U.S. accession to the treaty. Perhaps most importantly, our military leaders have stated that U.S. participation will help them maintain navigational rights — and with less risk to the men and women they command.

It has been long-standing policy that the United States does not take a position on the ultimate disposition of the competing maritime and territorial claims made by China and other countries in the South China Sea. But we do have a position on how the claims are adjudicated, and on how questions related to the different features — reefs, rocks, shoals and islands — are classified under international law.