Warning is not a Warning when nobody believes that you will indeed
carry out the threat, there have been so many "warnings" (don't do
this, don't do that, otherwise there will be consequences, don't test
the bomb/US will never tolerate a nuclear NK/Iran) sent to Iran and
North Korea so far that US credibility has become a joke, because they
did exactly what the US warned them not to do, and what they got?
ANOTHER WARNING. When you don't have the military resources, diplomatic
support and political capital to back it up, warning is just an
invitation for the world to see how powerless and stupid you are,
better to admit your weakness and try other routes.