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Zhang Zuolin in Manchuria was helped by the Japanese. Maybe you can find more on him. There's more on this in the article about his assassination by Japanese extremists* (or, rather, somewhat rogue members of the Japanese military). The latter article also mentions American and European support for the Zhili Clique, and Soviet support for the Kuomintang.
*- Note... the Japanese extremists committed the assassination, they didn't write the article. :)