thanks bro, it's rare to see a Pakistani support these days in regards to the South China Sea.Good going, Indonesia.
Indonesia needs to invest in quite submarines and best possible training of its crews from Western countries. Indonesia should play its card right by aligning itself with US and becoming a robust, powerful regional power.
As for the Chinese, they are laughable since nobody takes their claims seriously and the traffic through SCS continues as normal---despite Sino puppy squealing. Best they can do is to bring their fish trawlers and cause some annoyance to Indonesia/Malaysia (if that lol).
A potent submarine fleet is the best option to keep a bigger navy away.