America’s hand is not strengthened and it will not be by the things Nikki Haley suggests.
Russia and China would take action if the Natanz nuclear facilities were attacked with thermobaric weapons and inspection regimes to ensure compliance are only as good as your ability to effect inspections.
As Dr Alf knows as well, Iran gained from the Iraq war which we and America initiated and we will have to deal with them and the Russians in any settlement on Syria.
Iran’s Achilles heel is the desire of its young for a better life and more Western style freedoms, so it is they who need to be worked up into a frenzy of anticipation, so that they effect regime change from within.