Indonesia is for sure will get nuclear subs too, the option is either from China or Russia
Normally I would say Russia because it wouldnt want to be seen as taking sides or anything.
However Australian official declaration that it is a US
puppet ally against China, might give it the final push to go for Chinese subs.
Man, this security pact will be seen badly in the ASEAN region. It still shows how these Anglo countries dont understand ASEAN. It should make China's job easier at courting them and convincing them that it is the US and its puppets that threaten stability and not China.
Actually good news for China from a diplomatic point of view
Btw maybe it could also go for european subs (I find it highly unlikely though)