Hi everyone!

I am interested in professorship in Japan, in particular related to nature and social sciences. I am planning on receiving a Ph.D. in the U.S. and learning Japanese in the meantime. I would like to know as much as possible about opportunities to teach and research such subjects as psychology in Japan.

My questions are:
- Is it possible to teach a subject in English? Some universities in different countries (such as Netherlands) adopted undergraduate and graduate degrees taught completely in English. I'm wondering whether there is such opportunity in Japan.
- If not, what level of Japanese language proficiency is required to teach a full-blown course in social sciences? What kind of standardized tests are to be taken in order to prove this proficiency?
- How hard is it to obtain a position of Professor in Japan with an American B.A. and Ph.D. and is it difficult to get a visa afterward? By the way, I'm an international student myself (I'm originally from Russia), so that might complicate things.

I really appreciate your help with these questions.