If they want to gain independence from Vietnam, then may be they can just join China, since this area is just next to China. And China is a lot more prosperous.
美國駐越南大使館僅要求「各方克制」。華府近年積極與越南加強關係牽制中國.
The US just want to use Vietnam as part of their plan to contain China, therefore the US keep quiet about Vietnam.