If China ever decides to invade Taiwan, submarines from all the over Asia will secretly respond. Chinese ships will sink without knowing whose torpedoes took them out.
I hope so.
“If China ever decides to invade Taiwan, submarines from all the over Asia will secretly respond.”
Probably not. Think about the what’s required to attack the ship from another nation. If a submarine captain made the call by himself, he’d be arrested as he has perpetrated an act of war on behalf of his nation. (Similar to the group of lieutenants who involved Japan in a hugely expensive war with China they weren’t prepared for.)
It’s probable no nation would conduct a secret war as it is impossible in today’s age to conduct any meaningful large scale military action in secret. Spies, local assets and even the crews would soon let the secret out and conducting a secret war has its own legal, political and national dangers.
If China goes to war, I’d expect all the other regional powers to try their best to stay out of it. This isn’t WWI where the citizens of every nation KNEW they’d win and the soldiers would be home by Christmas. Even the lowliest peasant knows better today, and nobody wants their family to starve to death. (Starvation and disease are likely to kill more people than actual combat unless it goes nuclear.)