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Are you talking about the "UN tribunal" ruling made back in 2016 by the PCA? If so, your comments rely on certain assumptions, for example off the top of my head:
1. that it is accepted practice and normal for great powers to agree to the rulings of that particular arbitration court (or indeed any international tribunal), and that China is acting in an inconsistent way with past norms demonstrated by other similar actors
2. that the PCA in particular had jurisdiction to make a ruling on this matter (which China has always contested)
3. that the PCA is a "UN tribunal". The PCA isn't a UN court or tribunal -- it is merely an observer to the UN, but the UN's principal judicial body is the ICJ (international court of justice)
I hope you can see from these quick points (point 1 in particular) why you can't reasonably expect to make the arguments you've been putting out and not expect people to offer counter examples and to bring in historical context and past practice by other nations in response.
I don't have any problem with opposing views. Isn't it part of the political discussions you were supporting that should be opened up.
What you described as assumptions doesn't change the fact that there was a ruling even if China is disputing. Likewise China's claim that it has sovereignty is disputed just as China is disputing the ruling. The problem is there is a reluctance (even denial) to accept that there is a dispute and the sovereignty issue is unresolved. .