The act of removing organs from POWs violates the Geneva Conventions, which protect the dignity and rights of prisoners of war. Such actions, if confirmed, could be subject to international prosecution and sanctions.
'If confirmed'? I'd think the body being returned without internal organs would be confirmation enough.
What other excuse could Putin use? That rats got to the body and only ate the heart, liver and kidneys?
The point is that it's not really confirmed. It's like if putin says that they returned pow's with boots up their asses, you wouldn't just assume it's true. I'm not saying it's not true, but it also seems like a lot of work just to be a dickhead. I would assume they didn't remove the organs in a way that they could be put to use again.