Generally speaking powers defend together. However in G40 there are powers that start off neutral (Russia and USA) or not at war with each other (like Japan and UK/France). You could have a case at sea when you attack a sz with units from multiple powers, and can ignore the units that belong to a power that you aren’t yet at war with.
US 30 IPC bonus question
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You seem to confuse the one-time bonus with the 30-IPC bonus, that is granted for the fulfillment of the respective National Objective (NO).
Of course the one-time bonus is granted only once - but the NO-bonus is granted round by round, as long as the NO is fulfilled.
They are based on different requirements. -
@Panther Ok, thank you.
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@Krieghund Thank you!