China and the other countries are signatories to the UN Law of the Sea Convention.
As such what can be claimed as territorial waters is laid out clearly.
My opinion, China is not adhering to the Treaty, correct?
China initially agreed to multiparty talks to address the issue, now has reverted to one on one negotiation’s where significant pressure can be applied by China. Correct?
Basically China is attempting to shut out the US from an area ( Asia for the US) of immense strategic value to each.