The US is not immune to consequences.All this empty talk of international law. There is only 1 law among nations: power.
If the US wants to do something badly enough, we will do it. Conventions/treaties/international law is utterly meaningless if you do not have the strength to call a country to account for ignoring them.
And no one has the power to do that to the US without provoking a world war.
International law has only the force that the US allows it to have. if there's a part of it we want to ignore, we do. And there's nothing anyone can do about that.