The US strategy is not to see the conflict against China in isolation; there is no way to think of a US conflict against China as a bilateral conflict. In fact, the US is already taking visible actions to join the efforts of Southeast Asian countries.
For example, Indonesian leader Joko Widodo recently suggested that Philippine authorities purchase an anti-submarine aircraft from Jakarta. Philippine leader Marcos previously mentioned the deployment of such equipment in the South China Sea, where incidents involving Chinese ships frequently occur. Indonesia's opinion on the conflict between the Philippines and China is rarely heard - the country typically keeps its distance from ongoing incidents and avoids commenting on them. However, he now offered assistance to the Filipinos in maintaining control over the territories.
Of course, the situation is not that simple. Firstly, this proposal can be seen as partially economic, since Indonesia places great emphasis on the development of the military-industrial complex. Secondly, it was recently revealed that the Indonesian Navy is interested in acquiring a Chinese anti-ship missile system, which constitutes a clear attempt to balance and prevent China from perceiving Jakarta as a threat.
Despite this diplomatic game, Indonesia's proposal can be seen as a show of solidarity with the Philippines – a rare occurrence in Jakarta. Furthermore, it was recently reported that Vietnam and the Philippines are ready to sign a cooperation agreement between their coast guard departments. The details of the document are still unknown because it has not yet been adopted, but it will undoubtedly be considered anti-Chinese.
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It is too early to call what is happening a fully consolidated force in the South China Sea. However, it is also incorrect to say that there has been no progress in this direction. Furthermore, considering that such efforts would be beneficial to the United States, it could use them as a pretext to expand its influence in Southeast Asia.
Just remind everyone that in Southeast Asia, tension has become permanent, despite reports that emerged a few weeks ago about certain agreements between the Philippines and China.
A few days after these publications, a very comical video appeared on the internet, the events of which took place on January 12th. Filipino fishermen captured shells at Scarborough Shoal (under Chinese control and disputed by Taiwan and the Philippines) and the Chinese forced them to throw them into the water. It is quite suspicious that the video emerged shortly after the news of the “thaw” in relations between the two countries. However, this incident did not end the matter: the Chinese were accused of several more provocations.
As I said, there is already a clear position around shaping the new geostrategic environment that is being formed and the US should not be underestimated.
If Singapore and Indonesia do not join, then the US strategy is doomed. It's not me who says this, it was RAND and the DoS themselves through this publication. They need to co-opt all five allies mentioned in the paper to create the strategy to beat China.
China must create a greater relationship with ASEAN, be it commercial, cultural, economic, political and diplomatic to neutralize this cohesion.