Bro IF China achieved Escalatory Dominance, only the US will lead the charge with those country you mentioned will be dilly dallying with a lot of excuses....lol What about the 5 eyes, only Canada and UK will support the US because they are far away, Australia can easily be neutralized by a strong Indonesia and UK in 5 years time will be call England with it's capital in Manchester as London may seceded and join the EU.The americans seems to think and naively hope that in taiwan reunification war, the theather of war will only be limited to China, taiwan, japan and philipines, i don't think so
Now people see the value of NK...lol I remember some members questioning the viability of such treaty and call NK a liability. As long as China survive Korea will always be a Chinese vassal because she, Japan, Taiwan, Vietnam and even Mongolia are part of Sinocentric World.theoretically if the u.s really invades China via taiwan, and if the China-North Korea Treaty of Friendship, Co-operation and Mutual Assistance article 2 worth the paper its printed on, means that NK is obliged to join the war on China side regardless of south korea involvement
Afterall if China is defeated in taiwan strait, NK will be next so this conflict is also existential to them, NK can help distract japan by lobbing hwasong-12 missiles, even Russia can also stage massive wargames in sakhalin island
So many ways to keep japan honest