While I have elsewhere defended the original Japanese martial virtues (as opposed to the later perversion of those same virtues) , I am by no means blind to the heinous crimes various elements within the Japanese army comitted. Shizuo Ookha in his book “Fires on the plain” details some of them, including those by Japanese on fellow Japanese. Similarly, Romero in “Last man off Bataan” relates similar heinous atrocities.
In short, RS*, my friend, I have to agree with you here: while there were Japanese POWS that undoubtedly did suffer at Russian hands, I find it invidious to compare those few examples to the vast Pacific War examples known and to which you allude.
Respectful Regards, Uyraell.