It wouldn't happen as "simple-minded" as you think.Oh the drama, the drama. Neither China nor Russia would risk the end of the world for Iran, you silly drama queen.
It would be a series of escalations that would slowly draw us into a direct confrontation. Say war broke out with Iran and Russia sent a ship with military cargo on it. And we hit that ship. How do you think Russia is going to react to that? Do you actually think they're afraid of us? Are you that irresponsible?
You are getting even sillier with each lame attempt to bolster your argument. Are you really dim enough to believe Russia or China or any other country would get into a shooting would get into a shooting war with us over a ship? Are you?