Well, cant blame them though,any power with the capabilities ought to protect and further their interests as much as they can. Just like U.S,Russia, U.K,France etc do. The rest is secondary.
In this regard, I will give Vietnam a 8/10 in its ability to coerce some of its neighbours to toe their line and further their interests/influence. For a country their size, wealth and status they sure are good in maintaining control/influence in their region.
I WAS EVEN shocked when I found out that Vietnam controls more islands/territory in SCS/spratlys than any other country in Asia by quite a margin. THAT'S VERY IMPRESSIVE TO SAY THE LEAST. . To my Vietnamese buddies here
They have the East Asian Domination Spirit. After all , VIET NAM is a Confucian civilization , and an extension of China , actually. Confucian Dai Viet always considers themselves far superior , being that they had Confucuan core values , to the much less civilized foreign barbarians of the south; the Khmers, Siamese and even Malay societies. The southerners were considered extension of Hindu civilization, which is considered lower, in the classical militant Confucian school of diplomacy.
The Viets had every reason to exult, after all they defeated the uncivilized southern barbarians. And exterminated their threat to Vietic southern expansion.