if you want conquest thats true most of the time but war is not always about conquest, often its about gaining an advantage, long term they will need troops on the ground to take more terroitory but right now all thats needed is chaos, there is lots of ways to acomplish that, simply messing with the global food supply would be one way to go about doing this, unstable african = unstable middleast which is their goal, you could argue its espionage rather than war but thats just semantics