I assume you are asking about a land territory. The answer would be no. When you attack a land territory, you attack all country’s units that are in that land territory. So if Russia attacks an Italian territory that has German units in it, then Russia just declared war on Germany.
Sea zones are different. In a sea zone, you can attack one power’s units while other “neutral” power’s ships will simply sit there.
Guadalcanal - 1st player rule
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As with another AH game of the past (Mustangs) - make it part of the game that a player can pass the 1st player token at any time to their opponent. However, the US player can reject the pass with a dice roll of 6. This simulates the US breaking of the IJN code. Once broken the IJN must keep the 1st player token for the remainder of the turn. Rule phase 3, step 6; Pass the token, is not used.





