[Jim Noble]

China doesn’t care about international law, should we?

There's no such thing as "international law".

Law requires a lawgiver. The fifty States united have, under their Constitution delegated SOME of their lawgiving powers to a Congress where each State is represented by two delegates (they are called Senators).

That Constitution begins, "ALL legislative powers herein granted...", and goes on to describe the structures of the Congress, and what it can and cannot do.

No power to make laws that bind the 50 States united exists anywhere else on Earth.

[Winniesboy]

There's no such thing as "international law"

If two or more nations recognise that there is such a thing, and the same thing, as 'international law', then 'international law' exists.

If one or more nations refuse to recognise that there is such a thing as 'international law', then 'international law' does not ipso facto cease to exist.