What would you say to the Iranian Government? If you say “nothing”, what would that mean exactly? Alternatively – What would you do with the Iranian Government? If you say “nothing”, what would you expect them to do in response? Inaction and half measures speak louder than words.
You might want to read this ~ one of the countries is Australia
Or, if you prefer, invite Ahmadinejad to an important diplomatic confab, arrest him, try him for murder before a military tribunal, and execute him by firing squad. Then announce an international conference of learned scholars denying that you did so.
Or, if you prefer, seize or sink every ship leaving Iranian waters.
Etc. We have no lack of means to deal with these pipsqueaks. We lack men.