See what the Japanese government (or old power in Japan) has been spending the money on recently:
- Honda-Nissan merger (failed) - Seven Eleven counter buyout https://www.wsj.com/business/retail/the-fight-for-7-eleven-i...
Masayoshi Son is in a different league, for good or bad.
Investing in SoftBank.
MUFG, the Custody Bank, and Master Trust all have significant ownership stakes in SoftBank, and most Japanese conglomerates like NTT, NEC, etc tend to work closely with SoftBank on strategic deals
It's a whole can of worm I'll only leave here for any else to open, but Son Masayoshi was born in Japan from parents who might have formerly been Japanese (Korea was a Japanese colony) depending on the circumstances.
Many people in similar cases are basically undistinguishable from regular Japanese nationals culturally speaking.