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Just thought of it when I was buying my breakfast:
If there is going to be an alliance among a Germany (Kaiserreich? or Bund, or Custom Union), a Turkey (Ottoman or Republican), a Hungary (Kingdom?) and a China (or North China, Imperial or Republican), we might call it the " Ü Alliance ", because they are the rare countries who speak languages containing the letter "Ü".
And probably such alliance system doesn't seem too outlandish.