Originally Posted by Officer of Engineers

Taiwan has thus far refused any Japanese co-operation in its own military defence.[/QUOTE

Stupidity, pure and simple. I bet if that PLA Mech Division lands on their turf they'll change their tune, at which point the JMSDF will become a massive obstacle to the PLA-N.
And, as I said, they can count on no help from us, and likely most of the 'hood, due to our dependency upon Chinese trade for our economic stability.