Answer:
Very little; no country wants to be subjugated by another.
There were of course collaborators, those who could gain personal benefit by aiding the invaders, and there were of course a resistance, who fought against it; the reistsance was smaller but much more strongly held in its convictions, so that these effects were relatively equal.
In total, the populace were fairly malleable; the majority while still under the yoke of a controlling army, could still live their lives relatively the same way they always had.