Even US-JAPAN-INDIA-AUSTRALIA and NZ alone are already enough to contain China. VIETNAM and the PHILIPPINES can help in our small ways by acting as your unsinkable aircraft carriers.
When i talk about Asian countries from indian point of view i don't include Americans.
The extremely positive relationship with Vietnam is a result of our act east policies from 90s we focused on Vietnam. Same with Thailand.
Chinese are much more intelligent. In today naval environment you don't start a war you create anxiety which Americans try to make for Chinese by sending ships in South China sea. China do the same with india by paying money and buy out the nation like siri lanka and others to build port IOR to give indians a anxiety and if we cannot match them in indian ocean then our aim to become a net security provider gets disturbed.
To balance things out we need to corner Chinese in Asia with Asian countries such as Philippines Vietnam and japan.
It was not the Americans who used the term indo - pacific it was the Japanese president in india in 2009 the one who used this term.
This is not about a war in which we need other it's a game of influence.
India's Look East policy is an effort to cultivate extensive economic and strategic relations with the nations of Southeast Asia in order to bolster its standing as a regional power and a counterweight to the strategic influence of the People's Republic of China. Initiated in 1991, it marked a strategic shift in India’s perspective of the world. To contain Chinese Asia holds the key. From 1962 india worked to improve the relationship with anti Chinese countries.
And had a break through with Myanmar to which used to be a pro Chinese nation.