I think Japan, Vietnam, and Taiwan are signing a mutual agreement as well.
The world needs to be ready to deal with China.
Hopefully ready enough that China doesn’t push it.
Si vis pacem para bellum - if you want peace, prepare for war.
Vietnam is not to be underestimated. They have a very good military. They beat the US and CCP both in the 1970’s. Older folks will remember CCP aggression after the US pulled out, and it was not good for the CCP.
I use CCP instead of China, for a reason.