Is China preparing for Japan armed with nuclear? The

potential impact on China strategy in Asia is very negative.

I can not find any parallel between refuges inflow from N. Korea and nuclear Japan, nuclear S. Korea or even Taiwan

One is managable while another is strategical disaster for China.

Beside it would not be the first time for China to invade country, for example Vietnam conflict.

Occupation of N. Korea would reposition China strategically in Asia.