As mentioned in the OP, he speaks of the the Vietnamese government having 4 military outposts there, and their involvement in the dispute. A short term policy with the Philippines to bring US forces closer than 2 days away is being discussed as Manila is changing its tone on rotational basing, implementing US access to bases, and reworking a VFA (Visiting Forces Agreement).
And there is pressure from the Philippine government on a mutual defense treaty with the US.
Early this week, a Philippine military aircraft received warnings from a Chinese fleet when it flew over the Julian Felipe Reef to check the presence of Chinese vessels in an area considered way within the countrys exclusive economic zone (EEZ). Over 200 suspected Chinese militia vessels flocked the reef last month.
In a tweet on Wednesday, Locsin said shooting down a Philippine military aircraft in the West Philippine Sea could end in either of two things: start of World War 3 or end of the prestige of the United States as a superpower and policeman of the world.
https://mb.com.ph/2021/04/03/chinese-embassy-hits-lorenzanas-perplexing-statement-on-julian-felipe-reef-insists-it-is-part-of-china/