[quote=So Boerd]
Serious though. China and Japan aren't making any sense. You literally JUST fought FFGB three years ago. Why for any reason would you want to hurt their enemies? What dog does Japan have in this fight?
[/quote]

It's been 3 years and since then China/FFGB have been working to heal the rifts. In addition, China most likely sees the war in Europe as an opportunity to take back lands From Russia. It is opportunistic. Also since Japan is allies with China, they will join them to get a piece of the Russian pie.