[doall]

This is Mochizuki's informal blog post in Japanese about the current situation.

https://plaza.rakuten.co.jp/shinichi0329/diary/202001050000/

Although he had lived in the US for more than a decade and has no problem with the English language, he seem to have a kind of "western culture allergy" that is written in detail in the post below:

https://plaza.rakuten.co.jp/shinichi0329/diary/201711210000/

I think the "allergy thing" is the reason he doesn't want to follow the ordinary "western approved way" and do a tour in the US.

Also I have read somewhere that he is open to mathematical discussions via online or if you visit him in Japan.