So, to set the scene:
I'm France, 1943. SU isn't in the war. I've stopped the Germans in the Low Countries, and am steadily advancing in that area and liberating the countries. Both Belgium and Netherlands are still in the war, neither have been forced into surrender.
The UK and USA have spammed me with Divisions, and I have multiple armies composed entirely of their soldiers fighting on the Italian front (Italy is 1 VP province away from surrender, which is under attack. A dropped 3 Paratroop divisions on Rome and, despite being under constant siege for months, they've held the city and the German/Italian soldiers are largely trapped and without supply) and the Danish front.
Japan, however, has just finished with China. I fear they're eyeing up Indochina, and I have a mere 2 Divisions to defend the area. I have soldiers I can spare to beef up the garrison, but I had another idea.
Australia and NZ have a large enough army to allow me to mount a defence (in SF, only 2 provinces along the Indochinese north border have enough infra to use, so it's a bottleneck) but they won't help me.
I've set "defend here" allied objectives on an Indochinese port so they'd land soldiers and turn them over to me (as the AI does), allowing me to build an ANZAC defence army for Indochina. Combined they have 55 brigades, which is at least around 15 Divisions. That would be more than enough to hold the line until I can send my own armies into action when Germany is dealt with.
They will not, however, move at all. Their entire armies are in their homelands, doing nothing, they won't even send me a few Divisions.
Does anyone know any ways of kickstarting the AI in this regard? Their Divisions are doing nothing, Japan isn't at war with us yet, and Indochina will be the first target if they join the war.