This I put as a 2nd opinion with regards to Japan occupation in the asia region,.
I am not too sure on how Japanese occupied another countries other than Indonesia,.
However;
- As soon as Japan Invaded Indonesia, they formed many military formations which hoped to be the embrio of future Indonesia Armed Forces
they also trained some local to be a commissioned Officers - they even created my civil govermental bodies that helped The indonesian to administere their own matter.
- There were verbal promises made by prominent Japanese leader on Indonesia Independence.
- Soekarno was INDEED invited to Tokyo and met the Emperor with regards to Japan Promises on Indonesia Independence.
- Just after Japan Surrender, Japanese, despite of allied pressure on the colonized countries, they provides some assistances in Indonesia Pro Independence movement, Admiral maeda Suggested and assisted the proccess of Indonesia Proclaimation of Independence.
- Elements of Japanese Armed Unit, ignored the movement of local militia group, they even assisted the proccess of weapons/armory took by force of local militia, there were even at least half squadron of attack bi-plane stolen by republicans.
And this off course came with prices;
- Romusha also formed as forced labour to help with war infra-structure
- Jugun Ianhu was existed
Cheers