The only value to the US is to have a real combat test of the effectiveness of various weapons systems.
On the part of Russia the appropriate riposte would be to conduct a maximum effort bombardment aimed at causing as much damage to the enemy population centers as possible and trying very hard to track US material delivery and strike the delivery points with an explicit goal of killing as many S personnel in the material delivery teams and loudly broadcasting the casualties to the American people plainly stating How many dead American soldiers is the Ukraine worth to you?
I hope Putin is smarter than you are. Killing American soldiers, or civilians, is the best way known to get Americans angry and ready to fight. Just look at history.
If a country manages to kill enough Americans their destruction and defeat is certain.