consider a situation that Chinese government to invade Vietnamese waters in the South China Sea.

China government unilaterally and provocatively invades Vietnamese EEZ in the South East Asia sea (South China Sea). That illegal action not only threats the independence of Vietnam but also peaceful environment of East Asia where about 50% of worldwide trading value has been transported. The placement of Chinese oil rig also violates the UNCLOS and DOC (Declaration on Conduct of the Parties in the South China Sea) between China and ASEAN.
Thus, as one of the responsible nation of the world, the US should strongly oppose any Chinese provocative activity like this event.