What I said, and it’s only my opinion, is that he’s a pathological narcissist. If I’m right then he is capable of doing anything to anyone and his reasons will always be his own. Any appearance of loyalty to persons or ideologies is only that, an appearance. He is neither a hawk nor a pacifist. Those things are utterly meaningless to him. In his mind he is everything, the alpha and the omega. A pathological narcissist is the ultimate sociopath.
That’s broadly agreed. Of course, the damage a narcissist can do is directly proportional to the number of powerful people (and military commanders) that would comply with him during a meltdown.