Word is report on NHK revealed some details about the US-Japan talk, most importantly the two sides did not discuss placing medium range ballistic missiles in Japan at all.
Weather true or not, if NHK did report this would this not constitute Japan backstabbing US again after getting chewed out by Zhao Lijian and then getting a friendly visit by PLAN destroyers including a 055? Surely US would rather keep this vague and Japan revealing this is a "don't look at me, I'm not his dog" move.
I'm still trying to track down a first hand source.