No stopping Iran's quest for the bomb

Does anybody believe there is anything, short of a nuclear first strike, that will prevent Iran from going nuclear? If there is no stopping them, what's with all the posturing? It makes the Europeans look stupid. They'll look even worse when the Iranians are finished. It makes the US look weak to blather about a nuclear Iran being unacceptable, and not being able to stop it. Why all the bullshit?

UPDATE: Are the Iranians really going to halt production for two months? And so friggin' what if they are? If they do stop, they'll start back, and sooner than later.