@Little_Boot:
Can the Brits move troops into French Indochina if they are not yet at war with Japan?
Yes, as neither France nor England are neutral (they just aren’t at war with Japan). However, even if Paris has fallen, control of the territory will not transfer to the UK.
If France was at war with Japan, but the UK was not, the UK could still move units in to IndoChina (as both UK and France are at war with Germany), provided it was still under French control.
Russia does have special rules for situations like this, though.