Regarding the South China Sea, we can only fight, and the territorial issue cannot be resolved through negotiations.
Although Vietnam has dozens of Su30mk2 and Kilo class submarines, there is nothing to be afraid of.
It depends on whether the upper level has courage and firm but gentle.
Tactically,
If we teach Vietnam and the Philippines not only to attack the Nansha Islands and Xisha Islands, but also to attack the mainland, it is best that the first round of bombing and shelling can paralyze their domestic industries and destroy their counterattack capability, which can be accomplished by artillery, second artillery and cruise missiles.
I think Vietnam will collapse within a week after this devastating blow.