All views must be in favor of China

Please help me explain why UNCLOS DO NOT supersedes the Nine-dash line.

Please help me explain why China's Historic Rights is a customary law, and therefore, customary law [historic rights] is not covered by the UNCLOS.

What is the application ofjus cogens? [context: The UNCLOS does not have the status of jus cogens (like the UN Charter) to stump all other rights and obligations acquired by States under either customary law or other conventions.] Please help me elaborate.

What is the extent to which a customary law can keep a reserved domain?