Which victory do you think you will pursue?
I play Domination Victory only.
Is there a reason that you haven't (yet) conquered Vanguard? My point being ... sooner or later, Fielding is likely going to attack again. Why not just take her cities?
My thought process was that the NA were fighting two uber AIs already (Australia to the west, and the Russo-NSA Team of AIs to the north), and I didn't want to plant myself in the middle of that warzone (I was already at war with both those AIs anyways). As such I treated the NA as a buffer state, planted a spy in Central, and used my aircraft in interdiction strikes, either against wounded enemy units or on intercept missions. Or to put is slightly differently why should I do all the fighting and dieing when I could let the NA do it for me? And this approach then allowed me to focus on the Eastern Front where I was able to expand significantly during this same timeframe (i.e. the Hammer and Anvil approach I'd mentioned in my post above).
Updates: When the NA were finally collapsing I then moved into Vanguard with little resistance. The Australians completed their campaign against the Africans on my Southwestern Front, and then started a rather successful campaign against the Russo-NSA Alliance to the north, where I continually saw Khrabrost changing hands. Once I saw that the Australians were committed to their northern front I started my campaign against them in the far south, taking back the African bases on my immediate frontier:
And the longer term results of my strategy can be seen in the north where the Australians, now starved of reinforcements because they are dealing with my assault in the far south, are continually being pushed back by the Russo-NSA Alliance.
In the lower left area of the second pic you can see one of my skirmishers on the screen, and this is from my Eastern Front forces. The Australians have already asked for peace terms once, and now that I've secured Magan I'll probably accept their next treaty offering, and let them go back to focusing on their northern front (i.e. the "Lets you and him fight" approach) while I consolidate my gains in the south.
D