Dominion battlecruisers, Japanese concerns, and logistical costs

How would additional Dominion battlecruisers affect Japan and the United States?

A combined Commonwealth force would alarm both powers, although supporting several different classes would complicate logistics.

The Australian proposal combines an Admiral-class ship, a Renown-class ship, and older battlecruisers. Supporting that mixture would create a logistical burden. Further hypothetical Dominion acquisitions would add substantial strength under combined Commonwealth command. Japan and the United States would then face a much larger fast capital-ship force.