. SODon't worry about that. Vietnam had been a part of China during the past 2000 years, of course it was no problem to share the south China sea together with you before.But since Vietnam has separated from China now, it doesn't mean the all of islands of China in this region now belongs to Vietnam , right? Vietnamese now is acting too aggressive and greedy , they occupied most of islands in south China Sea by all means then sold those region to western oil company and earned trillions of dollars from it. Yet China has not drilled any oil wells in South China Sea so far, It is not because China has no ability to do it but China doesn't want to increase the tension and prefer to keep the peace around this region .
Based on your logic. Mongolia can now lay claim to China ang the whole SCS. How funny is that, you are claiming the seas based on history played out 2000 years ago. Move on chini man!