My initial reply is to suggest it goes against the promoted narrative of 'US as global policeman' to be seem fighting wars directly. Therefore the US devised an approach of empire expansion and wealth extraction by using proxy wars, a policy it has followed since the fall of the Berlin Wall. But Ukraine will be the last example of this policy, because the US recognises their expansion has been brought to a halt by Russia and China and Trump II and team are now making a tactical retreat, which will require extreme measures if the US is to avoid going bankrupt.

It is an error imo to think this is anything to do with morals or crimes as the people involved in these decision do not operate as normal people going about their life. They do not allow morals get in the way of their achieving their strategic objectives of gaining more power/money. It's all about the objectives. But the Russians and the Chinese know this, they are playing the same games although they have been oriented towards defending US expansion over the last 40 years so it will be interesting to see how world affairs unfold into this change of US strategy.

This is just unsubstantiated opinion of course and I always try never to become too attached to my opinions.