There was a UN SC solution and permission to use military force against ISIS. There is no UN SC solutions about declaration of any specific Venezuelan organisation as "terroristic", nor any UN SC declaration about allowing military ships attack unarmed civilian ships (whatever they are transporting). A Chinese military ship sinking a US MJ-transporting ship in high seas would commit an act of aggression against the USA. Same way, US military ship, attacking Venezuelan civilian ship, whatever it is transporting (exept slaves), is committing an act of unprovoked aggression againt Venezuela and, what is much more important - against the freedom of the sea trade.