That I am not sure about, but I do know that as long as Japan remains unrepentant towards South Korea and other countries in regards to WW2, there is a weakness that is there that even if South Korea joins the 6 eyes, there will always be friction for one and the one thing I do notice is that these eyes groups all have economies that are dependent in someway towards China and all of them seem to believe that democracy is the only path forward and is trying there hardest to force there ideas on China without consideration or proof that it is somehow how going to lead to a better future which as you can see with the UK and USA, this isn't really the case when the majority of the people are in the lower and middle class gap. I also notice that most of the strength of these so called 5 eyes is the USA and USA alone. The USA in the next two months will experience horror like none other in regards to the economy being in the dumps, a pandemic that won't go away, the prospects of there being no jobs for a long while and since Trump is trying to decouple from China there will be even less jobs, 50+ million unemployed who are about to become homeless and therefore desperate for help that they will go on a rampage (if I was homeless with my family and I have access to a weapon, then the conclusion is obvious) and given Trump's lack of empathy and lack of foresight, this is going end poorly and none of there security forces (NSA, FBI, CIA) are even remotely capable in regards to helping the people nor have the heart to care. Should the USA really get screwed and then lose the reserve currency peg, none of the 5-6-7 eyes are going to be remotely capable of messing with China given that none of them have the capability of harm China in the long run (just threatening not the do business with them is scary enough to shut Scomo, Boris Johnson and bloody Trudeau up for a while). Heck, if Japan really does try to do a WW2, China pay them back a million fold since now they have the weapons and people fight back. Not to mention that the majority of Japan lack the same fighting spirit that they have had during WW2 and the side effect of the USA efforts to keep Japan down has Ironically made them weak cannon folder that has figuratively lost there balls, heck, all there leadership are quite old and completely out of touch with there own people who are literally worked to death due to there economy being in a world of hurt thanks to the USA screwing them over (hence I find it quite confusing as to why Japan likes being under the USA when most nations would be quite pissed off at this, maybe they are abjectly scared of China's wrath should China ever decide to take vengeance, even though China isn't known for going that far (especially in recent history when they could have sent the army down to HK to mess people up yet they never did).