Is Putin a War Criminal?

 President Biden says Putin is a War Criminal, well if he is so were Presidents Nixon and Johnstone and let's not leave out Presidents Roosevelt and Truman while we are at it. All four authorised bombing of civilian targets in either World War II or the Vietnam War, while Truman of course ordered the dropping of nuclear bombs on Hiroshima and Nagasaki neither of which were remotely military targets.  

Of course civilian targets have been hit in the Ukraine and casualties incurred but it stretches belief that Putin ordered these attacks. Viewing footage of the war I am more and more puzzled.  A missile or a couple of shells land on an apartment block. Why? What possible strategic benefit has been gained by doing this? None. It almost seems as if some bored junior officer  in the Russian army said 'Oh Fuck it -I am bored -lets lob a couple of shells at the bastards'      

Is this a too far fetched explanation? I don't think so. The war -as we are viewing it -seems to be being conducted in a chaotic manner. I watch bemused as a single Russian tank wanders down a road only to be blown to smithereens. What on earth was it doing? Why was it there? 

So is Putin a war criminal? No not yet.  If he orders chemical or nuclear weapons then that is another matter but to call him a War Criminal is to stretch the meaning of that phrase too far.