In the vein of developing Joint/allied offensives, I'd like to suggest and extra couple of diplomatic options:
1. Declare war on [someone]
2. Target [x] region/city
3. Target [x] trade route/port
2 & 3 could be assigned on a "per theatre" basis -so each theatre has a different focus of operations.
The list could be extended to defensive operations too, e.g.: "Defend region/trade port".
These should help coordinate genuinely joint efforts between allies rather than the current "you cover my back, I'll cover your's" agreements and "oh! fancy meeting you here chaps" type military campaigns.
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