Given what little I remember of the Battles of Khalkhin Gol, I do remember Ki-27's claiming hundreds of I-16s shot down - one thing that was stated was
the Japanese were very impressed with the I-16's armor, some would take hundreds of 7.7's and still fly.
I have a book on Japanese Army Air Aces, and it goes into pretty good detail on the subject, I do recall the Japanese got their tail whipped at this skirmish, which was one of the reasons they left so many troops around Mongolia and Manchuria.