I remember a similar thread which was created a few years back. We debated for many months, and in the end the thread died without any solid solution to the issue. IMO, the only solution that is going to be acceptable to all is a decision by the UN. But it needs to be seen whether the Chinese will accept it.
There is no solid solution to the issue but only for them to resolve it by themselves. UN or any other country not related intervening could worsen the situation. I hope some big group would help stop the activities which destroys and scars those reefs.