Azeri Turkish and Japanese are both believed to belong to Agglutinative languages. I am an Azeri Turkish speaker and a Japanese language learner. I would like to know what these two languages have in common.
Not everyone goes along with all of Ruhlen's work, although I usually follow his language family tree to get an idea of where a language is related.
I don't know the literature, but I do know that there are many many correspondences between Turkish and Japanese. I've studied Japanese and written some beginning work on a Turkish translator. I also studied Kichwa (Quichua) in Ecuador, and it has all the earmarks of an "Altaic" language. I showed my teacher how Turkish works, and he burst out, "That is KIchwa!" (Not the vocab but the grammar!)
Here's tje website where you can try out Quichua, should you be interested. (of course I think you SHOULD be interested.) :-) In the help files, there is a compendium of the sentences that have been tested. .
Let's see if any expert in Turkish and Japanese can answer your question as to research that has been done in this field.