To take a quote from a film:
"The President can bomb anybody he likes."
(points for the film name)
The fact of the matter is that it's up to the Joint Chiefs and their Chairman to decide what nation they bomb, not the UN, not Russia or the PRC, not even Europe.
Will there come a day when a nation turns around and says 'No' and America gets a nasty shock...maybe...eventually every power meets its match in some form. For us it was World War One, for the Romans it was the Visigoths. For the moment though we're just along for the ride. So, getting all riled up and attacking each other and the moderators isn't going to do a thing except make yourselves look silly because at the end of the day we have as much control over the decision making process of the United States as a Snail has over the Sun.