Australia supplied critical troops to campaigns in North Africa and the Mediterranean while relying on Britain for strategic protection. A carrier strike on Sydney, combined with Japanese advances through Southeast Asia, could trigger panic and demand the return of Australian formations. Japan could use the resulting delay to fortify captured resource areas and begin extracting fuel before American entry. The resulting burden would intensify Britain's shortage of capital ships, carriers, submarines, and trained staff across multiple theaters.
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Sydney and the strain on British global power
Attacking Australia could force Britain to divert forces across the empire without automatically bringing the United States into the war.