This interviewee in a documentary claims that Chinese Warlords in the Warlord Era were supported by foreign powers. I assumed from this that the interviewee meant big ex-colonial countries, like England or France. Or local countries like Russia. However, I cannot find any evidence to support this statement.
Doing various searches in multiple places, I have found no mention to this. None especially in the sources listed below. Was this man mistaken? Or Were the Chinese Warlords backed by other countries?